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Ingredients/Mineral/Zinc

Zinc.

The immunity welder. Over 300 enzymes in your body need it to work.

StrongResearch strength11 to 30mgDaily amount250Studies read

Reviewed March 2026

ZIMineral
ZincIngredientMD
Category
Mineral
Also filed under
ImmunitySkinDNAMineralRecovery

What Zinc is, and what it does.

Does it work
Yes, if you're low. Common deficiency, especially in athletes, vegetarians, and older adults. An essential mineral your body can't make.
How much to take
15-30mg daily. Picolinate, gluconate, or citrate are good forms. Take it with a meal to avoid nausea.
Time to feel it
Over about five days of lozenges started within 24 hours of symptom onset.
The first dose
Nothing, unless you take it on an empty stomach. Then you'll feel nauseous. Seriously, take it with food.
With regular use
Fewer colds, maybe clearer skin if you were deficient. Helps maintain healthy testosterone levels. It's about prevention, not a feeling.
How well tolerated
Well tolerated at standard doses. Taking 50mg+ long-term is a bad idea. It can mess up your copper levels. More is not better here.
How it feels
You don't feel it kick in. It's a background worker. The benefit is noticing you get sick less often or that a stubborn breakout finally clears up.
The overlooked benefit
Zinc is what lets your liver mobilise vitamin A. Without enough of it, vitamin A stays stuck in storage even when you are eating plenty.

How common this is.

Public health figures for this ingredient, reported by the agencies that publish them, cited and dated.

Population figures from public health data. Context for the category, not a statement about any individual and not a claim about this product.

11 to 30mg a day is where Zinc works.

How much to take a dayHigh confidence
Up to 11mgA supporting role. Common in blends where this is one active among several.
11 to 30mg
Daily maintenanceThe everyday amount, and where most daily supplements sit. This is the one you take month after month.
Above 40mgPast what the research covers. More capsules rather than more effect.
MORE EFFECT ↑015mg30mg plateauDAILY DOSE →
The shaded band is where the dosing trials landed.

Source: NIH ODS + Prasad 2008 zinc review

How long it takesStrong
WHAT THE TRIALS MEASUREDthe level the trials measuredDay 0TIME ON IT →
Builds over over about five days of lozenges started within 24 hours of symptom onset

Across three randomised placebo-controlled trials pooled as individual patient data (199 adults with naturally acquired colds, 80 to 92 mg of elemental zinc a day as acetate lozenges), 70 percent of the zinc group had recovered by day 5 against 27 percent on placebo, and colds ran 2.73 days shorter against a 7 day average duration. A separate meta-analysis of seven lozenge trials (575 participants, doses above 75 mg a day, zinc acetate or zinc gluconate) measured cold duration 33 percent shorter, with no significant difference between the two salts.

The proof, claim by claim.

These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.

Extensively studied.

Essential trace mineral.

4 citations on page
  • Reduces duration of the common coldMeta-analysis of 7 RCTs (n=575)
  • Improves inflammatory acne severitySystematic review of 12 clinical studies
  • Prevents testosterone decline during intense trainingSingle RCT (n=10 elite athletes)
PubMedCochraneClinicalTrials.govNIH ODSSUPP.AI250 studies readLabs test. IngredientMD verifies.PubMedCochraneClinicalTrials.govNIH ODSSUPP.AI250 studies readLabs test. IngredientMD verifies.

Questions people ask about Zinc.

Best time to take zinc?
With a meal. Any meal. Taking it on an empty stomach often causes nausea.
Can I take zinc every day?
Yes, at the right dose. Stick to 15-30mg for daily use. This isn't a 'more is better' supplement.
Will zinc help with a cold?
Yes, if you start right away. Zinc lozenges can shorten a cold. Use them for a few days, not long-term.
Is zinc good for acne?
It can help, especially for red, angry acne. It calms down inflammation.
Can you get too much zinc?
Absolutely. High doses long-term interfere with copper absorption, which is a problem. Stick to the recommended range.
Does it interact with other supplements?
High doses of iron or calcium can reduce zinc absorption. Take them at different times of the day if you're taking high doses of all three.

What the trials show about these together.

Outcomes the engine found studied for these actives as a combination, not one at a time. Each is a finding a named trial measured, cited and dated, never written by the brand.

Research strength. Research strength says how much work stands behind the combination. It is never a product score.

Fail closed. Where actives were studied on their own rather than together, the record shows each on its own evidence, never a combined effect no trial measured.

Independent record. Every finding is cited to a named trial, dated, and never written by the brand.

Findings from trials that studied these actives as a combination. Context for how the actives were tested together, not a statement about any individual and not a claim about this product.

Pairs well with18 on file

Why these belong in the same formula. Each row says what the basis is, from settled biochemistry through to a trial that measured the pair.

Zinc + CopperEstablished mineral antagonism

Zinc and copper are taken up by the same intestinal cells, and a steady high zinc intake raises a binding protein called metallothionein that holds onto copper and carries it out as those cells are shed. Formulas often include a little copper alongside zinc so that ongoing zinc use does not draw down normal copper status.

Zinc + IronShared absorption pathway

Zinc and iron compete for the same mineral uptake route in the gut, so large single doses of one taken together in water can lower how much of the other is absorbed. Spacing them apart or taking them with a meal eases the competition and keeps normal absorption of both.

Zinc + Vitamin AEstablished biochemistry

Zinc is needed to build retinol-binding protein, the carrier that moves vitamin A out of liver stores and through the bloodstream to tissues, and zinc-dependent enzymes help convert retinol between its working forms. Keeping zinc adequate lets the body transport and use its vitamin A normally.

Zinc + Calciumcompetition for absorption

A supplemental calcium dose lowers zinc uptake from the same meal, partly through competition for divalent transport and partly by raising luminal pH. Standard practice moves a large calcium dose to a different part of the day.

Zinc + Manganeseshared DMT1 transporter

Zinc and manganese both cross the enterocyte through DMT1, so a high zinc dose reduces manganese uptake from the same meal.

Zinc + L-Histidineamino acid carrier

Histidine forms a small soluble complex with zinc that the intestine takes up readily, and it is one of the two ligands that carry zinc in plasma.

Zinc + L-Cysteinechelation that aids uptake plus storage protein supply

Cysteine chelates zinc into an absorbable neutral complex, and metallothionein, the cysteine-rich protein that holds zinc inside cells, depends on cysteine supply.

Zinc + Vitamin Dtransporter expression and receptor cofactor

Vitamin D raises expression of the intestinal zinc transporters, and the vitamin D receptor is itself a zinc-finger protein that needs zinc to bind DNA.

Zinc + Vitamin B6 (Pyridoxine)shared enzyme requirement

Delta-6 desaturase, the step that converts linoleic acid onward to GLA, needs both zinc and vitamin B6, so a shortfall in either stalls the same conversion.

Zinc + L-Carnosinesingle chelated molecule

Zinc and carnosine are combined as one chelated compound that stays intact along the stomach lining rather than dissociating like a simple zinc salt.

Zinc + Phytasereleases a bound mineral

Phytate from grains and legumes binds zinc tightly and carries it past the absorption sites; phytase splits the phytate and frees the zinc for uptake.

Zinc + Folatecomplex formation in the gut, both directions

High-dose folic acid and zinc can form a poorly absorbed complex in the intestinal lumen, and the conjugase enzyme that releases dietary folate is itself zinc dependent, so the interaction runs each way.

Zinc + Tannic acidEstablished chemistry: galloyl and catechol groups on tannins chelate divalent metal ions including zinc

Hydrolysable tannins from tea, coffee and some botanical extracts carry multiple phenolic hydroxyls that bind divalent zinc in the gut and lower its uptake when both arrive together. The effect is dose dependent and specific to the same sitting, not to overall intake. Spacing a zinc dose from strong tea or a tannin-rich extract avoids the overlap.

Zinc + GlutathioneZinc induces metallothionein and stabilises thiol groups; glutathione is the main cellular thiol buffer

Zinc drives transcription of metallothionein through the metal-responsive transcription factor, and metallothionein and glutathione together set the cell's thiol and metal buffering capacity. Cell work shows zinc status shifting glutathione content and the enzymes that regenerate it. Those are markers of redox handling rather than clinical outcomes.

Zinc + Whey protein isolateEstablished absorption chemistry: dietary amino acids and small peptides keep zinc soluble and available for uptake

Zinc absorption improves in the presence of amino acids and peptides that form soluble complexes and keep the ion from precipitating or binding phytate. Whey supplies cysteine-rich and histidine-containing peptides of exactly that kind, which is the same chemistry behind amino-acid-chelated zinc forms. It is one reason zinc from animal-protein meals is absorbed more readily than from a phytate-heavy plant meal at the same zinc content.

Zinc + InulinFermentable fibre lowers colonic pH and increases mineral solubility; the effect on zinc is smaller and less consistent than on calcium and magnesium

Fermentation of inulin-type fructans produces short-chain fatty acids, drops colonic pH and keeps divalent minerals soluble further along the gut, which raises the fraction available for absorption. Most of the human work on this concerns calcium and magnesium, with zinc studied less and results less consistent. The honest reading is a plausible, modest and inconsistent enhancement.

Zinc + MagnesiumBoth are divalent cations sharing some intestinal transport capacity; competition is described mainly at high single doses

Zinc and magnesium are both divalent cations, and large single doses of one can reduce absorption of the other where they compete for the same non-specific pathways. At the amounts found in ordinary multi-mineral formulas the interaction is small. Where high doses of both are taken, splitting them across the day removes the question.

Zinc + Vitamin CWidely co-formulated; a meaningful effect of ascorbate on zinc absorption has not been demonstrated

Zinc and vitamin C appear together in immune-support formulations, and zinc ascorbate exists as a salt, but unlike its clear effect on non-heme iron, ascorbate has no established effect on zinc uptake. Where studies did not detect a difference, that is a failure to detect one, not proof that none exists. The pairing stands on independent rationales for each nutrient.

Who should be cautious

Nothing specific on file for Zinc. Match the label to the daily amount above, and tell your doctor what you take.

Not medical advice. Show the label to your pharmacist.

What Zinc actually does.

Established

Zinc sits inside hundreds of enzymes, either doing the chemistry or holding the protein in shape. Unlike iron or copper it does not switch between charge states.

Established

Many proteins that switch genes on and off wrap around a zinc ion to hold their shape. No zinc, no shape, no binding to DNA.

Established

The gut raises or lowers how much zinc it lets through depending on how much the body already has. There is no zinc storage depot, so regular intake matters.

Established

Large zinc doses make gut cells produce a protein that traps copper and carries it out with the shed cell. That is why long-term zinc use needs copper alongside it.

Mineral, 5 steps on record

Where Zinc comes from.

The zinc in a capsule started underground as ore, was refined, and was then paired with an acid to make a salt the body can absorb. Whatever the pairing, the zinc itself is the same ion. Refining is also what strips the lead and cadmium that ride along in raw ore, which is why testing matters.

From a mineral source, then refined and usually bound to a carrier so the body can take it up.

Starts as
Sphalerite ore

Nearly all commercial zinc starts as sphalerite, a zinc sulfide ore, mined and concentrated by flotation.

Converted by
Roasting and refining

The concentrate is roasted to zinc oxide and refined to metal or high-purity oxide, the two starting points for every supplement salt.

Converted by
Salt formation

Refined zinc is reacted with the counter-ion acid: gluconic acid for gluconate, citric acid for citrate, picolinic acid for picolinate, or chelated with glycine for bisglycinate.

Purified by
Recrystallisation and testing

The salt is recrystallised and tested against heavy-metal limits, since lead and cadmium travel with zinc ores and the specification exists to strip them.

Ends up as
Milled powder

The finished salt is milled to a blendable powder; the elemental zinc fraction differs by salt and is what the label's elemental figure declares.

Getting Zinc from food.

The whole-food sources on file. A supplement closes the gap, it does not replace dinner.

OystersBeef (ground)Crab

A gram-for-gram figure (how much of each you would eat to match a dose) will appear here once it is sourced and reviewed. This page will not print a number it cannot cite.

The forms it comes in.

Zinc oxideAbout half of a 10 mg dose taken without food was absorbed in a 15-person study. In fortified foods it showed no significant difference from sulfate.Fits Fortification of flours, cereals and beverage powders, where the isotope literature was generated. Dry tablets, capsules and powder blends where water solubility is not needed and where the elemental density lets a high zinc target sit in a small dose form alongside other actives. Neutral flavour makes it workable in unflavoured powders.Trade-off Measured absorption depends heavily on the setting. Taken alone without food in a 15-person isotope crossover, median fractional absorption was 49.9 percent, lower than the citrate and gluconate arms in the same participants, and three of the 15 absorbed little or none. In fortified foods, a review of isotope studies found no significant difference from zinc sulfate.Wegmüller 2013, J Nutr ↗
Zinc sulfateIn hospital trials, zinc sulfate added to phototherapy lowered bilirubin slightly in full-term newborns with jaundice. Absorption data come from one eight-person crossover.Fits Formulas that reproduce a published clinical protocol using the same salt and hydrate. Effervescent tablets, drops, syrups and reconstituted powders where full water solubility is the constraint. Clinical and institutional formats where the sulfate counter-ion is the established one.Trade-off The largest randomised evidence for this form sits in a hospital indication, zinc sulfate as an adjunct to phototherapy in jaundiced newborns, which describes a treatment setting rather than everyday supplementation, and the pooled effect carried high heterogeneity with no significant difference in preterm or low-birth-weight infants. In a separate eight-person crossover taken with milk, fractional absorption from zinc sulfate was lower than from gluconate and aspartate, on eight volunteers. The taste needs masking in liquids.de Oliveira 2024, Eur J Pediatr ↗
Zinc gluconateAbout 61 percent of a 10 mg dose taken without food was absorbed in one small study. In high dose lozenge trials the gluconate ones showed colds about a quarter shorter.Fits Cold-season lozenges, where the taste profile and dissolution in the mouth are the whole point of the format, and daily capsules and liquids. One of the few forms carrying both a stable-isotope absorption measurement and randomised duration trials, which suits a formula that wants human data on the exact salt on its label.Trade-off The absorption figure comes from a single 10 mg dose taken without food by healthy adults, so it does not describe absorption from a meal or in people who are deficient. In the lozenge meta-analysis the gluconate trials shortened colds by 28 percent and the acetate trials by 40 percent, and the 12 point gap was not significant, an underpowered comparison the author reads as gluconate lozenges possibly being as effective, not as demonstrated equivalence. The low elemental share makes high doses bulky.Wegmüller 2013, J Nutr ↗
Zinc citrateAbout 61 percent of a 10 mg dose taken without food was absorbed in one 15 person study, with no measured difference from gluconate in the same people.Fits Syrups, drops, chewables and gummies, where taste is a formulation constraint and where the sensory profile is the reason the form was taken into a human trial in the first place. The relatively high zinc share for an organic salt keeps dose weight down in flavoured formats.Trade-off The whole human case rests on one 15-person single-dose isotope crossover in healthy adults taken without food. No status-marker or clinical-outcome trial isolates this form, so nothing is known from human data about how it behaves with a meal, over weeks, or in people who are deficient.Wegmüller 2013, J Nutr ↗
Zinc picolinateHair, urine and red-cell zinc rose in a 1987 crossover in 15 healthy volunteers, a finding that has not been replicated. A later taste trial split, no subjective change, objective measures higher.Fits Daily capsules and tablets where a chelated organic form is wanted and where solubility is not a formulation constraint. Formulators reaching for it generally point to the 1987 tissue-marker crossover, still the only human head-to-head in which this form appears.Trade-off The human evidence is thin and old. The absorption case is a single 15-person trial from 1987 read out on hair, urine and erythrocyte zinc rather than isotope tracers, and it has not been replicated with modern methods. The largest outcome trial on this form, in taste disorder, found no difference from placebo on its subjective endpoints, with a difference on one objective measure and on serum zinc.Barrie 1987, Agents Actions (canonical foundational trial) ↗
Zinc bisglycinateOne small six week pilot in young women, at a dose above the adult upper limit, saw blood zinc rise in the glycinate group while the copper marker did not change.Fits Daily capsules, tablets and blends where a chelated organic form and a neutral taste are wanted, including formulas that pair zinc with other minerals in the same dose form. The small chelate size keeps the raw weight manageable at everyday zinc targets.Trade-off The supporting human study is a pilot intervention with ten young women per arm at 60 mg zinc daily, above the 40 mg tolerable upper intake level for adults, so the reassuring copper-status reading was taken at a dose most consumer formulas do not use, over only six weeks. No stable-isotope absorption study in humans has measured this form.DiSilvestro 2015, Biol Trace Elem Res (pilot intervention, placebo-controlled) ↗
Zinc monomethionineA one to one complex of zinc with the amino acid methionine, sold most often under the OptiZinc trade name. It is an amino acid complex rather than an inorganic salt such as oxide or sulphate, so the zinc travels bound to a single amino acid carrier and about a fifth of the material's weight is elemental zinc. It is a stable, largely odourless powder that handles well in capsule and tablet blends.Fits Formulas that want a named branded ingredient on the panel, and blends already built around amino acid complexes rather than mineral salts. The powder is free flowing and neutral in taste, so it suits capsules, small tablets and stick packs where an inorganic salt would add grit or a metallic note. Modest serving weight keeps room in a crowded capsule fill.Trade-off It costs several times more per milligram of elemental zinc than oxide or sulphate, so it raises cost of goods on a high dose product. The methionine carrier is a sulphur bearing amino acid, which some formulators count against a total sulphur load. OptiZinc is a trademark held by a raw material supplier, not a mark of independent review.
Zinc orotateThe zinc salt of orotic acid, a small pyrimidine carboxylic acid that occurs in dairy. Two orotate ions carry one zinc ion, so the orotate accounts for most of the molecular weight and the elemental zinc share is low compared with oxide or citrate. The salt is a pale crystalline powder with limited water solubility.Fits Capsule products in the mineral orotate family, where magnesium orotate or lithium orotate already sit on the same panel and a formulator wants one carrier chemistry across the mineral set. The powder is stable and does not carry the astringency of some soluble zinc salts, which suits a swallowed capsule rather than a chewable.Trade-off The low elemental share means a larger capsule fill or a second capsule to reach a normal zinc serving. It sits at a higher price per milligram of zinc than the common salts, and the orotate portion is a second substance on the panel that most labels do not quantify. Human outcome research on this specific salt is thin, so the row is structural only.
Zinc ascorbateA salt pairing one zinc ion with two ascorbate ions, so a single ingredient carries both zinc and vitamin C. Ascorbate makes up most of the weight, leaving a low elemental zinc share. It dissolves readily in water and gives an acidic, tart solution, which is characteristic of the ascorbate ion rather than the zinc.Fits Immune-positioned powders, effervescent tablets and chewables where vitamin C is already on the panel and combining the two into one raw material simplifies the blend and the ingredient list. Good water solubility makes it workable in drink mixes where oxide would settle out. The tartness reads as citrus in a flavoured base, so it needs less masking than a metallic-tasting salt.Trade-off The vitamin C carried in is not optional, so it has to be counted against the panel's total vitamin C rather than treated as a bonus. The low elemental zinc share means a lot of material for a normal zinc serving, and ascorbate is sensitive to heat, moisture and oxygen, which narrows the packaging and process options. Human outcome work on this specific salt is limited.Active and formulation aid
Zinc aspartateA complex of zinc with aspartic acid, an acidic amino acid that binds the metal through its side chain carboxyl as well as its backbone. It is the zinc member of the aspartate mineral family that also includes magnesium and potassium aspartate. Moderately water soluble, supplied as a white to off-white powder with a mildly acidic character.Fits Sports and recovery formulas built on the aspartate family, where magnesium aspartate is already present and one carrier chemistry keeps the panel coherent. It is common in European tablet products and dissolvable formats. The moderate solubility works in a tablet that has to break down quickly without needing the high solubility of sulphate.Trade-off The aspartate carrier adds an acidic amino acid that a formulator may want to count in a product already carrying free amino acids. Cost sits above the common inorganic salts, and the elemental zinc share is lower than oxide, so tablet weight rises. Human outcome research specific to the zinc aspartate salt is limited, which is why this row carries no clinical claim.
Zinc lactateThe zinc salt of lactic acid, one zinc ion with two lactate ions. Lactate is a small, food-familiar organic acid, and the resulting salt is water soluble with a mild, slightly milky taste rather than the sharp metallic note of some zinc salts. It is a long-standing food and oral care grade ingredient as well as a supplement raw material.Fits Lozenges, chewable tablets, toothpaste and mouth rinse style products, and food or beverage fortification where taste is the binding constraint. The mild flavour is the whole reason it is chosen: a format held in the mouth needs a zinc source that does not force heavy masking. Good solubility also suits ready-to-mix powders and clear liquids.Trade-off The elemental zinc share is lower than the inorganic salts, so a lozenge or tablet has to be larger or carry less zinc than the same format built on acetate or gluconate. It is more expensive than oxide, and its soluble, acidic character can interact with other ingredients in a compressed lozenge base, which usually means a reformulation of the excipients rather than a drop-in swap.Active and formulation aid
Zinc acetateThe zinc salt of acetic acid, supplied as the dihydrate. It is highly water soluble and dissolves quickly at mouth temperature, and it carries a higher elemental zinc share than most organic salts because acetate is a small carrier. The taste is sharp and distinctly astringent, and the material is hygroscopic, so it draws moisture from the air.Fits Lozenges above all, where fast dissolution in the mouth is the design goal, and any liquid or effervescent format that needs a zinc source that will not settle out. The high solubility also suits sachets and shots. Where a brand wants a compact lozenge, the relatively high elemental share keeps the tablet small.Trade-off The astringent taste is real and needs a serious flavour system, which is a formulation cost rather than a defect. Being hygroscopic, it demands tight moisture control in manufacturing and packaging, so blister packs and desiccants are common. Soluble zinc salts taken on an empty stomach are a known source of nausea complaints, which is a dosing and labelling matter for the brand.
Zinc malateThe zinc salt of malic acid, the dicarboxylic fruit acid found in apples. Both carboxyl groups can engage the zinc ion, so the salt behaves as a simple organic mineral salt with moderate water solubility. Its taste is mildly tart and fruit-like rather than metallic, following the character of the malate ion.Fits Powders, chewables and effervescent formats where a fruit-acid flavour base is already in play and malate reads as part of the flavour system rather than against it. It also appears in formulas built around the malate family alongside magnesium malate, giving one carrier chemistry across the mineral set.Trade-off It is a less common raw material than citrate or gluconate, so supply and documentation are narrower and a second-source plan matters. The elemental zinc share is lower than the inorganic salts, adding weight to the serving. Human outcome research on this specific salt is limited, so no clinical claim is carried here.
Zinc taurateA complex of zinc with taurine, a sulphonic amino acid rather than a standard carboxylic one, so the bond chemistry differs from the glycinate and aspartate chelates. It appears on labels mainly in the mineral taurate family alongside magnesium taurate. The powder is neutral in taste and moderately soluble.Fits Formulas already built on taurine or magnesium taurate, where holding one carrier across the mineral set keeps the panel and the product story consistent. The neutral taste suits capsules and swallowed tablets. Taurine on the panel is itself a familiar ingredient to shoppers, which is part of why the form gets chosen.Trade-off Specification varies between suppliers and the term taurate is used loosely across the trade, so a certificate of analysis is the only way to know what a given lot actually is. It is a niche raw material with a higher price than the common salts, and published human work on the zinc taurate complex specifically is scarce, which is why this row stays structural.
Zinc-enriched yeastNot a salt. Saccharomyces cerevisiae is grown in a zinc-rich medium so the mineral is taken up into the yeast cells and bound to yeast proteins and other cell constituents, then the biomass is dried and milled. The zinc arrives as part of a food matrix, and the elemental share is low because most of the material is yeast. Panels print it as food-grown or whole-food zinc.Fits Whole-food and food-grown positioned multivitamins, plant-based ranges and tablets where the ingredient list is meant to read as food rather than chemistry. It blends well into pressed tablets and capsules and brings a mild savoury note that a food-forward base tolerates. It is the form to reach for when the panel itself is part of the marketing.Trade-off The low elemental share means a larger serving or more capsules than any concentrated salt, which pushes up both tablet size and cost per milligram of zinc. Yeast is a common allergen concern for some shoppers and is excluded from certain diets, so it narrows the audience. Batch to batch variation in the biomass makes tight assay control a supplier question, not a label one.
Zinc carbonateBasic inorganic carbonate salt with low water solubility; requires gastric acid to release the ionFits Compressed tablets and topical or powder applications where a dense, low-solubility zinc source is wantedTrade-off Release depends on gastric acid, so low stomach acid limits it; the carbonate also has a mild buffering effect on stomach contentsActive and formulation aid
Zinc chlorideHighly water soluble ionic salt; strongly astringent in solutionFits Oral rinses and topical solutions where fast dissolution and a surface astringent effect are the purposeTrade-off Astringency and gastric irritation are why it is not typically used for oral dosing at nutritional amountsFormulation aid
Zinc histidine complexZinc coordinated by histidine, mirroring the amino acid complexes that carry zinc in plasma and in the gut lumenFits Formulations aiming to keep zinc soluble in the presence of dietary phytateTrade-off Higher material cost and a lower zinc percentage by weight than the inorganic salts, so the capsule is larger for the same elemental amount
Zinc acexamateZinc bound to epsilon-acetamidocaproic acid; the organic ligand releases the ion gradually along the gutFits Preparations where a slower, less locally concentrated zinc release is intended for gastric toleranceTrade-off It is regulated as a medicine in some countries rather than as a supplement ingredient, and elemental zinc per gram is low
Zinc glycerophosphateZinc salt of glycerophosphoric acid; moderately soluble and near-neutral in solutionFits Liquid and chewable formats where taste and low astringency matterTrade-off It contributes phosphate as well as zinc, and it is less studied than the common gluconate and sulfate saltsActive and formulation aid
Zinc in our library14 forms

Same mineral in different salts. Each is its own molecule with its own page, and absorption and feel differ from one to the next.

See all 14 forms
Chelated Zinc (Zinc Bisglycinate)Zinc AcetateZinc Acetate DihydrateZinc Acetate (Lozenges)Zinc AspartateZinc CarnosineZinc Carnosine (PepZin GI)Zinc ChlorideZinc CitrateZinc GluconateZinc Monomethionine (OptiZinc)Zinc OxideZinc PicolinateZinc Sulfate
Blends built around it
Zinc (Immune)Zinc (Testosterone)
What the strongest studies found

The essence, in one line each.

  1. Pooling three randomized trials, zinc acetate lozenges shortened the duration of common cold symptoms by about 2.7 days against a roughly seven-day average.Meta-analysis. Hemilä et al., 2016 (British Journal of Clinical Pharmacology). PMID 27378206 ↗
  2. In children older than six months, zinc supplementation may shorten the average duration of acute diarrhea by about half a day, a mean difference of roughly 11 hours across nine trials, on low certainty evidence.Systematic review and meta-analysis. Lazzerini and Wanzira, 2016 (Cochrane Database of Systematic Reviews). PMID 27996088 ↗
  3. Across 36 studies in children under five, zinc supplementation modestly increased linear growth; in the studies reporting absolute change, about 10 mg a day for 24 weeks added roughly 0.37 cm in height versus placebo.Meta-analysis. Imdad and Bhutta, 2011 (BMC Public Health). PMID 21501440 ↗
  4. Pooling randomised trials in adults, zinc had a small effect on body weight and waist circumference and no detectable effect on body mass index, fat mass, fat-free mass or adipokine levels, and the authors call the size of the changes minor.Meta-analysis. Salmani et al., 2026 (Biological Trace Element Research). PMID 41617950 ↗
  5. Across four trials in women of reproductive age, zinc lowered reported total premenstrual symptom scores (Hedges g -0.38) and emotional symptom scores (g -0.35) at moderate certainty, with physical symptoms (g -0.51) resting on low certainty.Meta-analysis. Kim et al., 2025 (Women and Health). PMID 40737185 ↗
  6. Across six trials with 739 women, zinc lowered reported menstrual discomfort scores (Hedges g -1.54), with larger reductions when taken for eight weeks or longer and an effect seen at doses as low as 7 mg of elemental zinc a day.Meta-analysis. Hsu et al., 2024 (Nutrients). PMID 39683510 ↗
  7. Across 77 trials, zinc on its own during healthy pregnancy raised maternal serum zinc (SMD 0.32 second trimester, 0.51 third), cord blood zinc and one-minute Apgar scores, and was linked to greater birth length and head circumference, while zinc with iron and folate added nothing over iron and folate alone.Meta-analysis. Diao et al., 2025 (Journal of Evidence-Based Medicine). PMID 40836314 ↗
  8. Pooling randomised trials in young women, zinc supplementation was associated with milder self-reported physical and mood-related symptoms around the menstrual cycle.Meta-analysis. Haider et al., 2025 (European journal of obstetrics, gynecology, and reproductive biology). PMID 40435711 ↗
  9. In Tanzanian infants, daily zinc supplementation shifted circulating metabolomic markers, showing that supplemental zinc reaches and alters measurable metabolism.Randomised trial. Liu et al., 2024 (The Journal of nutrition). PMID 38092153 ↗
  10. Pooling trials in adults with long-standing liver impairment, the reviewers reported changes in biochemical measures including serum zinc and blood ammonia with supplementation; those are laboratory markers, and clinical endpoints were reported less consistently.Meta-analysis. Gong Y et al., 2026 (BMC Nutrition). PMID 41527112 ↗
  11. Serum zinc concentration below a defined threshold was associated with worse recorded outcomes in this observational cohort; an association in a cohort is not evidence that low zinc caused the difference.Cohort study. Tanaka Y et al., 2026 (Nutrients). PMID 42124080 ↗
  12. A systematic review of how consistently caregivers gave the full recommended oral zinc course to children under five with acute loose stools; the endpoint is adherence to the regimen, not whether zinc changed the illness.Systematic review. Pradhan SK et al., 2025 (Epidemiology and Infection). PMID 41178278 ↗
  13. A secondary analysis of a randomised zinc trial identifying factors associated with vomiting during an episode of loose stools; these are associations found within trial data, not effects the randomisation was designed to test.Randomised trial. Edwards JG et al., 2025 (Journal of Pediatric Gastroenterology and Nutrition). PMID 39806793 ↗
  14. A placebo-controlled randomised trial measuring circulating inflammatory markers and markers of gut barrier integrity after zinc supplementation; all primary readouts are blood markers rather than clinical events.Randomised trial. Baissary J et al., 2025 (Nutrients). PMID 40431411 ↗
  15. An open-label randomised comparison measuring body fat mass after zinc supplementation in adults on maintenance dialysis; open-label design leaves expectation effects on body composition measures unaddressed.Open-label trial. Fukasawa H et al., 2025 (Therapeutic Apheresis and Dialysis). PMID 39400501 ↗
  16. Oral zinc was tested against control using bioelectrical impedance phase angle and vector analysis as the endpoints in boys with a genetic muscle-wasting condition; phase angle is a body-composition marker, not a functional outcome.Randomised trial. Vermeulen-Serpa KM et al., 2024 (Nutrients). PMID 39408270 ↗
  17. A randomised controlled trial of zinc supplementation in very low birth weight infants reporting growth and biochemical measures during the neonatal stay.Randomised trial. Sahin S et al., 2024 (American Journal of Perinatology). PMID 37939725 ↗
  18. Serum zinc concentrations were measured after supplementation in very low birth weight infants; serum zinc is a status marker and moves with supplementation, which does not by itself describe a clinical effect.Randomised trial. Hiruta S et al., 2026 (Nutrition). PMID 42314307 ↗
  19. A systematic review and pooled analysis of newborn trials that gave zinc and measured bilirubin concentrations and the need for phototherapy; the included trials were small and varied in dose and timing.Systematic review. Chitiki GDR et al., 2026 (Journal of Neonatal-Perinatal Medicine). PMID 41994906 ↗
  20. The published protocol for a randomised trial of zinc in young infants with severe clinical illness in Tanzania, setting out dose and endpoints; it reports no results.Randomised trial. Manji KP et al., 2025 (BMJ Paediatrics Open). PMID 40813142 ↗
  21. A combined intervention of a teach-back education model plus zinc supplementation was compared against usual care in children, with symptom scores and immune markers reported; because two components were given together, the contribution of zinc alone cannot be separated.Randomised trial. Qin Y et al., 2025 (African Journal of Reproductive Health). PMID 40387134 ↗
  22. A single case describing neurological signs alongside low copper status in a person taking large amounts of supplemental zinc over an extended period, consistent with the known effect of high zinc intake on copper absorption; a single case cannot establish how often this occurs.Case report. Silva MTT et al., 2026 (Practical Neurology). PMID 40866286 ↗
  23. A systematic review of zinc supplementation in lambs reporting growth performance, mineral metabolism and nutrient digestibility; findings are in a ruminant animal model and do not transfer to human dosing.Animal study. Darabi M et al., 2026 (Biological Trace Element Research). PMID 40634832 ↗

These are the studies our verdict leans on, chosen from the 8,967 we read for Zinc. The full linked list is below.

Primary evidence

The studies, linked.

10 sources behind our Zinc verdict: peer-reviewed studies and registered clinical trials. Every one links straight to PubMed, the journal, or ClinicalTrials.gov. Read them yourself.

  1. ClinicalTrials.gov ↗
  2. ClinicalTrials.gov ↗
  3. ClinicalTrials.gov ↗
  4. Clinical trialZinc Intervention in Nursing Home Elderly
    PHASE1 · 31 participants · Completed
    ClinicalTrials.gov ↗
  5. ClinicalTrials.gov ↗
  6. ClinicalTrials.gov ↗
  7. ClinicalTrials.gov ↗
  8. ClinicalTrials.gov ↗
  9. ClinicalTrials.gov ↗
  10. ClinicalTrials.gov ↗

Evidence surfaced via Semantic Scholar (Allen Institute for AI) and ClinicalTrials.gov. Ranked by study type and citation weight, not cherry-picked.

Side effects reported to the FDA

Problems people have reported.

Read this carefully. These are 1,043,237 voluntary, unverified reactions reported to the FDA (openFDA). The number mostly reflects how popular Zinc is, not how risky it is. A report is not proof Zinc caused anything. It is a signal of what to watch for, nothing more.

Drug Ineffective
34,993
Fatigue
34,092
Pain
31,386
Nausea
25,338
Arthralgia
24,738
Off Label Use
24,555

Source: openFDA adverse-event reports. Voluntary reporting, not an incidence rate.

Every figure on this page, at source

Labs test. IngredientMD verifies.

Hemilä et al., 2017 (Open Forum Infect Dis)Meta-analysis. Time to effect, over about five days of lozenges started within 24 hours of symptom onset.PMID 28480298
Hemilä et al., 2016 (Br J Clin Pharmacol)Meta-analysis. Time to effect, over about five days of lozenges started within 24 hours of symptom onset.PMID 27378206
Hemilä, 2017 (JRSM Open)Meta-analysis. Time to effect, over about five days of lozenges started within 24 hours of symptom onset.PMID 28515951
Girodon et al., 1999 (Arch Intern Med)Studied together, immune.PMID 10218756
Sources checked 21 July 2026. A strength word says how much research stands behind a claim. It is never a product score.Educational information about an ingredient, not medical advice and not a claim about any specific product. Statements about ingredients have not been evaluated by the Food and Drug Administration. Bring the label to your pharmacist.

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.