Two-Per-Day.

The gap this formula speaks to.

Public health figures the engine matched to this formula's ingredients. Reported by their source, cited and dated, never written by the brand.

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

Every one of these is a fact the engine could ground.

Each line below was derived from this formula's own record at the time of verification. Nothing here was written by the brand, and nothing can be added that the evidence does not carry.

• Studied in people22 human studies on Zinc back this formula, each one cited.
• A mechanism that is settledHow Vitamin A and Vitamin C work is settled pharmacology.
• Studied together, not just separatelyVitamin A and Vitamin E have been studied together, not only separately.
• Recent work on the recordThe most recent study on this record was published in 2026.
• Serving amount inside the studied rangeEach serving carries 470 mg of Vitamin C, inside the range the published research used.
• A stated daily maintenance amountVitamin C is here at a daily maintenance amount, which is what a daily supplement is for.
• Why this formatIt is a capsule, so the amount per serving is fixed and travels without measuring.
• The exact form, describedThe label names its forms exactly: Retinyl palmitate, Ascorbic acid, Vitamin D3 in a carrier oil, lanolin-derived. The record says what each one is and what it suits.
• Full label disclosureEvery ingredient on this label carries its own declared amount.
• Where it comes from and how it is madeVitamin A is made by more than one route.
• Positions this formula already qualifies forThis formula already qualifies for positions beyond the one it is sold into, on the evidence it carries.
• A position nobody is holding yetSome of those positions are ones almost nobody is selling to yet.
• Interaction screen on the recordEvery active on this label was screened against the interaction record, and the screen is published with it.

The combinations the trials actually measured.

Two pairings in this formula have been studied as combinations in human trials. Each finding below is what a named study measured, cited and dated, never written by the brand.

• Zinc + SeleniumImmune

  In a two-year trial in older adults, zinc taken together with selenium improved the antibody response to influenza vaccination.

  Girodon et al., 1999 (Arch Intern Med)PMID 10218756

  Early
• Magnesium + Vitamin B6Calm

  In an 8-week randomized trial of 264 stressed healthy adults with low magnesium, magnesium plus vitamin B6 and magnesium alone reduced perceived stress about equally overall. In the prespecified subgroup that started with severe stress, the combination improved stress scores 24% more than magnesium alone.

  Pouteau et al., 2018 (PLoS One)PMID 30562392

  Early

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.

The size of the effect, in plain numbers.

Where a trial measured an actual number, we show it next to the claim. It is the average across the trials, never a promise about one person.

What the trials show about timing.

Time-to-effect windows the engine read from the trial record. Each is a window a named study measured, cited and dated, never written by the brand.

• Vitamin Cwithin 24 hours of a single doseMeasured within a day

  In a randomised crossover trial, 12 healthy adults consumed 101.7 mg of vitamin C as a powder, as raw fruits and vegetables, or as juice, and plasma vitamin C rose after every intake form, with plasma and urinary levels tracked over the 24 hours following the single dose.

  Choi et al., 2025 (Nutrients)PMID 41228404

  Strong
• Vitamin D3about 3 months of daily useBuilds with daily use

  In the trial record, blood vitamin D rises for about 3 months of daily vitamin D3 and then holds at a plateau, near 69 nmol/L at 1,000 IU a day, from a starting level near 41 nmol/L.

  Vieth et al., 2001 (Am J Clin Nutr)PMID 11157326

  Early
• Vitamin Eabsorbed slowly, tracked over 72 hoursMeasured within a day

  In a 3-phase crossover using two deuterium-labelled forms of alpha-tocopherol, healthy women absorbed about 55 percent of an oral dose taken with a 40 percent fat meal and about 64 percent with a fat-free meal, with samples tracked over 72 hours. The authors conclude absorption is not limited by absent fat or fasting, and that vitamin E leaves the intestine by a prolonged process.

  Traber et al., 2019 (American Journal of Clinical Nutrition)PMID 31495886

  Promising
• Thiamine (Vitamin B1)about 18 to 30 days of restricted intakeBuilds with daily use

  In the controlled depletion study the EFSA reference opinion reviews, restricting thiamin intake to 0.009 to 0.015 mg/MJ for 30 days brought urinary free thiamin excretion from a mean of 0.283 mg/24 h down to undetectable levels by day 18 of the depletion period.

  EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA), 2016 (EFSA Journal)PMID 42006014

  Promising
• Thiamine (Vitamin B1)about 1 week of renewed intakeBuilds with daily use

  In the same depletion and repletion record the EFSA reference opinion reviews, erythrocyte transketolase activity fell progressively to about 75% of baseline during the 30-day depletion period and returned to its baseline value after 1 week of thiamin repletion.

  EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA), 2016 (EFSA Journal)PMID 42006014

  Promising
• Riboflavin (Vitamin B2)about 8 weeks of daily intakeBuilds with daily use

  In an intervention the EFSA reference opinion reviews, adults whose baseline riboflavin intake and status were unknown received 5 mg/day of riboflavin for 8 weeks, and haemoglobin concentration, haematocrit and erythrocyte count all rose significantly over that period.

  EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA), 2017 (EFSA Journal)PMID 32625611

  Early

Windows measured in the cited trials. Context for how the active behaves over time, not a statement about any individual and not a claim about this product.

How each ingredient usually behaves over time.

12 ingredients, from each one's own page.

• Vitamin AWeeks, not days

  Weeks to months. Liver stores buffer intake, so vitamin A status moves slowly and shows up on a blood panel rather than as a sensation.

  Its own page, the plain answer on timing ↗

• Vitamin CWithin hours

  Blood levels rise within hours and tissue pools fill over days. Collagen-linked changes in skin and gums build over weeks and show as tissue quality, not as a sensation.

  Its own page, the plain answer on timing ↗

• Vitamin D3About six to twelve weeks

  25-hydroxyvitamin D climbs over roughly six to twelve weeks of daily dosing before it plateaus. It's a blood level you watch rather than a feeling.

  Its own page, the plain answer on timing ↗

• Vitamin EWeeks, not days

  Plasma alpha-tocopherol climbs within days of daily intake, and anything you'd notice in skin condition is a slow change across a couple of months.

  Its own page, the plain answer on timing ↗

• Thiamine (Vitamin B1)About a couple of weeks

  Where intake has been low, markers of energy metabolism respond within days to a couple of weeks. Where intake is adequate, the change shows in blood levels.

  Its own page, the plain answer on timing ↗

• Riboflavin (Vitamin B2)Within hours

  Urine turns bright yellow within hours of the first dose. Status itself, read as red cell glutathione reductase activity, shifts across two to eight weeks.

  Its own page, the plain answer on timing ↗

How each ingredient usually behaves over time, from its own page on IngredientMD. General timing for the ingredient, not a measurement of this product.

The same ingredient, carried differently.

What each form is, and where it fits in a formula. Measured findings carry the study that reported them.

• Cholecalciferol (vitamin D3)

  The animal-sourced form of vitamin D, made in skin under UVB light and produced commercially from lanolin. Fat-soluble, so it travels with dietary fat and is stored in body fat.

  Fits

  Raising and holding vitamin D status, and the form most supplement trials use.

  Trade-off

  Being fat-soluble it accumulates with sustained high dosing, so intakes are set against the tolerable upper level rather than topped up freely.

  In a 12-week double-blind randomised controlled trial in 108 young women in urban Bangalore, most of whom began vitamin D-deficient, daily vitamin D3 at 400, 600 or 800 IU in a fortified wafer raised serum 25-hydroxyvitamin D, parathyroid hormone fell over time, and effects on bone-turnover markers were modest and not dose specific. The 800 IU dose brought 65 percent of participants to sufficiency.

  Peris et al., 2026 (Nutrients)PMID 42124077
• Riboflavin

  The free vitamin B2 molecule, an isoalloxazine ring joined to a ribitol sugar chain, supplied as the unmodified crystalline compound with no added salt or phosphate group.

  Fits

  It is the form most panels list simply as riboflavin or vitamin B2.

  Trade-off

  It is intensely yellow and only sparingly water soluble, so it can tint a finished product and tends to resist dissolving cleanly in a liquid or a fast-melt format.

• Nicotinic acid

  The free-acid form of vitamin B3, pyridine-3-carboxylic acid. It is the reference form of niacin, a small water-soluble molecule carrying a bare carboxylic acid group on the pyridine ring.

  Fits

  The long-standing reference form for meeting a vitamin B3 requirement.

  Trade-off

  This is the form behind the familiar warm, tingling skin flush that many people notice soon after a larger dose, a recognized property of the free acid that leads some formulators to reach for an amide or ester instead.

• Myo-inositol

  The most common naturally occurring stereoisomer of inositol, a six-carbon sugar alcohol (cyclohexanehexol). It is the form found in most foods and in the body's own inositol pool, and is supplied as a free white crystalline powder.

  Fits

  It dissolves readily in water with a mild sweet taste, so it suits high-gram powders, stick packs and drink mixes where a large scoop needs to go into solution cleanly. It is also the form the bulk of inositol research has used.

  Trade-off

  Doses are counted in grams rather than milligrams, so it adds noticeable bulk to a capsule line and usually pushes a product toward a powder or several capsules per serving.

• Alpha-lipoic acid (racemic)

  A 50:50 mixture of the R and S enantiomers of lipoic acid, sold as the free acid. The same molecule is also labelled thioctic acid.

  Fits

  A low-cost form to produce and the one used across most of the older clinical literature, which makes it a straightforward default for a general-purpose formula.

  Trade-off

  Half of the labelled material is the S enantiomer, which does not occur naturally, and as a free acid it can polymerise when exposed to heat or stomach acid.

  In an open-label four-way crossover in 24 adults, a racemic solution produced higher peak plasma concentrations of both enantiomers than the 200, 300, and 600 mg tablet forms.

  Hermann et al., 2014 (Clin Pharmacol)
• Mixed tocopherolsActive and formulation aid

  A blend of all four naturally occurring tocopherol homologues in the RRR configuration, typically gamma-dominant when recovered from soybean oil distillate

  Fits

  Products that want the full homologue profile found in vegetable oils, and oil formulations where gamma and delta forms contribute most of the in-container stabilisation

  Trade-off

  Circulating vitamin E responds mainly to the alpha fraction, so the total tocopherol figure on a label is not an alpha-tocopherol figure

1 more
Quercetin phytosome
Quercetin combined with food-grade phospholipids from sunflower or soy lecithin into a phytosome complex, where the flavonol sits within a phospholipid matrix rather than being bonded as a salt.
Fits
Pairs the flavonol with a lipid carrier so it disperses in a phospholipid matrix, which suits formulas built around a lower flavonol dose per serving delivered in a lipid-compatible powder.
Trade-off
In a randomised six-sequence, three-period crossover pharmacokinetic trial in twelve healthy fasting adults, a single oral dose of quercetin phytosome produced higher plasma quercetin exposure and peak concentration over 24 hours than unformulated quercetin.
Riva et al., 2019 (Eur J Drug Metab Pharmacokinet)

Descriptions of the form itself, read from the cited studies. Not a comparison between products and not a statement about any individual.

Capsule

It is a capsule, so the amount per serving is fixed and travels without measuring.