Calcium Magnesium Zinc with D3.

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 people20 human studies on Vitamin D3 back this formula, each one cited.
• A mechanism that is settledHow Calcium and Magnesium work is settled pharmacology.
• Studied together, not just separatelyCalcium and Vitamin D3 have been studied together, not only separately.
• Recent work on the recordThe most recent study on this record was published in 2026.
• Why this formatIt is a tablet, so the amount per serving is fixed and it stores well.
• The exact form, describedThe label names its forms exactly: Limestone-derived calcium carbonate, USP, Magnesium oxide, heavy, Zinc oxide. 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 madeCalcium is made by mineral.
• 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.

The combinations the trials actually measured.

One pairing in this formula has been studied as a combination in human trials. Each finding below is what a named study measured, cited and dated, never written by the brand.

• Calcium + MagnesiumStrength

  In a 12-month randomised, double-blind trial, 98 adults aged 50 and over drank a litre a day of either a naturally calcium- and magnesium-rich mineral water or a low-mineral water. The mineral-rich group had fewer falls at the 6-month assessment and higher appendicular muscle mass, with the minerals delivered as drinking water rather than a capsule.

  Moretti et al., 2026 (Nutrients)PMID 41683292

  Promising

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.

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.

• Calciumwithin about one to six hours of a single doseMeasured within a day

  A randomised cross-over trial in ten women of mean age 69 gave a single 500 mg dose of calcium as citrate fasting, citrate with a meal, fortified juice or a dairy product meal, with blood drawn before and at 1, 2, 4 and 6 hours. Serum ionised and total calcium increased significantly from baseline over six hours, with the rise similar after fortified juice, delayed when citrate was taken with a meal and smaller after the dairy meal. A separate double-blind cross-over trial in 25 postmenopausal women measured parathyroid hormone and a bone resorption marker 12 hours after a single calcium dose. Ten participants is a small sample, and what moved was blood chemistry, not a sensation.

  Bristow et al., 2015 (Br J Nutr)PMID 25851635

  Thomas et al., 2008 (Calcif Tissue Int)PMID 18553042

  Promising
• 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

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.

Four ingredients, from each one's own page.

• Calcium

  Two clocks. The reaction with stomach acid happens within minutes. The bone contribution is slow and reads on a scan over months, not as a sensation.

  Its own page, the plain answer on timing ↗

• MagnesiumWithin hours

  Bowel effects can show within hours at larger single amounts. Moving blood and tissue magnesium takes weeks, and that part shows on a panel rather than as a feeling.

  Its own page, the plain answer on timing ↗

• ZincAbout three to four weeks

  Zinc status moves over roughly three to four weeks of daily intake, and it shows up on a blood panel rather than as a same-day 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 ↗

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.

• Calcium carbonate

  Calcium carbonate is the calcium salt of carbonic acid, an alkaline white powder that is poorly soluble in water and goes into solution in acid. It carries 40 percent elemental calcium by weight, so 1250 mg of the salt supplies 500 mg of calcium.

  Fits

  High dose calcium tablets taken with food, where the elemental share keeps the tablet count and the tablet size down. The salt's alkalinity also suits chewable and antacid style formats, and it presses and coats predictably at high loadings.

  Trade-off

  Its dissolution depends on stomach acid, and calcium citrate is the form indicated for people with achlorhydria or on proton pump inhibitor therapy. Head to head absorption results conflict: a pooled analysis favoured citrate, a later controlled crossover found the two identical.

  In a randomised four-period, three-way crossover in 24 vitamin D replete postmenopausal women, marketed calcium carbonate, encapsulated calcium carbonate and marketed calcium citrate produced identical 24-hour time courses for the increment in total serum calcium, with no significant between-product difference in serum iPTH suppression. An earlier meta-analysis of 15 studies in 184 subjects reported calcium absorption from citrate higher than from carbonate by 20.0% across the whole set, 27.2% on an empty stomach and 21.6% with meals, so the two bodies of evidence do not agree. Carbonate is 40% elemental calcium by weight. In a randomised double-blind crossover in 27 healthy women, 500 mg/day of calcium as carbonate did not change stool frequency or Bristol Stool Form Scale scores.

  Heaney 2001, Absorbability and cost effectiveness in calcium supplementationPMID 11444420
• Magnesium oxide

  Magnesium bound to oxygen. About 60 per cent of the molecule by weight is elemental magnesium, which is the highest share of the common forms and follows from the molecular weight rather than from any trial.

  Fits

  formulas where action in the gut is the intended effect, and tablets that need to carry a large elemental load in one unit

  Trade-off

  poorly soluble in water, which a 2025 review links to low bioavailability, though a 24-week head-to-head found plasma magnesium responses similar across the oxide, citrate and sulfate arms

• Zinc oxide

  An insoluble inorganic oxide, roughly 80 percent zinc by weight, so a small physical amount carries a large amount of elemental zinc.

  Fits

  Tablets and capsules where a high elemental yield in a small footprint matters, and topical preparations where insolubility is the point.

  Trade-off

  Dissolution depends on gastric acid, so uptake is more variable across people and with antacids than for a pre-dissolved salt.

• 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

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

Tablet

It is a tablet, so the amount per serving is fixed and it stores well.