Vitamin D, Calcium & Magnesium

Vitamin D, calcium and magnesium reference formula at example amounts of 10 mcg, 1,000 mg and 500 mg per serving, developed as a four-tablet serving or a liquid.

Vitamin D, Calcium & Magnesium is a reference formula for brands building a three-active bone-nutrition product around example amounts of 10 mcg (400 IU) of vitamin D, 1,000 mg of calcium and 500 mg of magnesium per serving. The reference label behind the default amounts is a four-tablet serving, and the brand sets the final amounts for its market.

Tablet is the lead format because the two minerals weigh about 3.3 g as raw materials per serving and are split over four tablets, and a liquid version carries a smaller mineral amount in a larger volume. The development work centers on mineral salt weight, the microgram-level vitamin D premix, and the magnesium amount against the adult upper intake level.

Ingredient Composition

IngredientPer ServingRaw Material FormAlternative Form (same amount of active)
Vitamin D10 mcg / 400 IU (example amount)Cholecalciferol (vitamin D3) dry powder, specified on vitamin D content; 10 mcg vitamin D per servingVitamin D3 in an oil carrier for the liquid, or ergocalciferol (D2) as a separate option, declared on its own basis
Calcium1000 mg (example amount)Calcium carbonate for tablets, specified on elemental calcium content; 1,000 mg calcium per servingCalcium citrate for the liquid, with the input recalculated to elemental calcium
Magnesium500 mg (example amount)Magnesium oxide for tablets, specified on elemental magnesium content; 500 mg magnesium per servingMagnesium citrate for the liquid, with the input recalculated to elemental magnesium

Amounts are stated as mcg of vitamin D, mg of elemental calcium (Ca, 40.08 g/mol; PubChem CID 5460341) and mg of elemental magnesium (Mg, 24.305 g/mol; CID 5462224). Reference labels state vitamin D in mcg or in IU, and IU amounts are converted at 40 IU = 1 mcg, following the FDA 2019 guidance, which gives 1 mcg cholecalciferol = 40 IU vitamin D; 10 mcg therefore equals 400 IU. Element content by weight follows from the anhydrous molecular weights: calcium carbonate 40.0% (CID 10112, 100.09 g/mol), calcium citrate 24.1% (CID 13136, 498.4 g/mol), magnesium oxide 60.3% (CID 14792, 40.305 g/mol) and magnesium citrate 16.2% (CID 6099959, 451.12 g/mol). Hydrate state and assay of each purchased salt are set with the supplier.

Intended Benefits & Formula Rationale

This formula is designed for products positioned around bone and skeletal nutrition. Vitamin D, calcium and magnesium are included together so that one serving carries the vitamin and both minerals that the cited reviews discuss in the context of bone.

Intended Benefit DirectionKey IngredientsFormulation Rationale
Daily calcium and vitamin D intakeCalcium, Vitamin DIncluded because the 2011 Institute of Medicine report sets calcium Recommended Dietary Allowances of 700 to 1300 mg per day and vitamin D allowances of 600 IU per day for ages 1 to 70 and 800 IU per day from age 71, based on skeletal health [1]. Evidence: Referenced
Bone nutritionVitamin D, Calcium, MagnesiumA narrative review states that supplementation with calcium and vitamin D is key to the management of osteoporosis and that vitamin D is essential in patients at risk of fracture, that calcium alone is not recommended for fracture prevention in the general postmenopausal population, and that data on the efficacy of magnesium supplementation on bone are inconclusive [2]. Evidence: Mixed

The amounts are examples that a brand moves for its market, and the combination is a design choice that the brand and its market review confirm.

Available Formats

The vitamin D, calcium and magnesium reference formula is built for a four-tablet version and a liquid version; counts per serving are design choices that the brand can adjust.

FormatUnitPer ServingPack SizeOther Ingredients (typical)Suitability
Tablet4 tabletsVitamin D 10 mcg, calcium 1000 mg, magnesium 500 mg240 tablets (60 servings)Cellulose, silica, stearic acid, magnesium stearate, glycerin, film coatLead format; matches the four-tablet reference label
Liquid30 mLVitamin D 10 mcg, calcium 1000 mg, magnesium 500 mg450 mL bottleWater, citric acid, sweetener, flavor, preservativeDissolved salts; solubility sets the serving volume

Raw Material Input & Fill (Design Estimate)

Design estimates. The input is the element amount divided by the element content of each salt at an assumed 100% assay, with vitamin D3 as a dry powder at an assumed 100,000 IU per gram. Tablets use calcium carbonate at 40.0% (2,497 mg per serving) and magnesium oxide at 60.3% (829 mg per serving); the liquid uses calcium citrate at 24.1% (4,145 mg) and magnesium citrate at 16.2% (3,093 mg). Ten mcg of vitamin D3 needs 4 mg of the powder.

FormatRaw Material Input per UnitDesign FillBalance for ExcipientsVerification Before Scale-Up
TabletPer tablet: CaCO3 624 mg, MgO 207 mg, D3 powder 1 mg1000 mg tablet weight168 mgCompression behavior, hardness, disintegration, vitamin D content uniformity, content assay of the three actives
LiquidPer serving: calcium citrate 4145 mg, magnesium citrate 3093 mg, D3 oil grade for 10 mcg30 mLWater, acid and flavor systemSalt solubility, clarity, pH, taste, preservative efficacy, content assay of the three actives

Capsule and gummy versions are separate projects, because a salt load of this size needs many capsules or a different matrix.

Formulation Considerations

Salt load and tablet count. About 3.3 g of calcium and magnesium salts per serving, split over four tablets, sets the tablet weight and the daily tablet count. A brand that wants fewer tablets moves to smaller mineral amounts, and the tier is chosen together with the pack.
Magnesium amount against the upper intake level. The NIH Office of Dietary Supplements lists 350 mg per day of supplemental magnesium as the tolerable upper intake level for adults [3], and the 500 mg example exceeds it. Smaller tiers of 250 and 300 mg appear among the reference amounts, and the magnesium tier is settled in the market review before pilot work.
Microgram vitamin D in a gram-level blend. Ten mcg of vitamin D is about 1 mg of dry powder per tablet next to hundreds of milligrams of salts. A premix of the vitamin D powder and a blending order are set first, and content uniformity across tablets decides whether the dilution holds.
Liquid solubility. Carrying 1,000 mg of calcium and 500 mg of magnesium as citrates needs a large volume or a solubility study. Serving volume, pH and taste are fixed in sampling, and a smaller liquid tier is the fallback.

Customization Options

Brands adjust the amount of each active, the mineral salts, the format and the add-ons.

ParameterRangeNote
Vitamin D per serving5, 10 or 12.5 mcg (200, 400 or 500 IU)Examples for the brand; IU converted at 40 IU = 1 mcg; D3 is the default form
Calcium per serving500, 600 or 1000 mgExamples for the brand; unit count scales with the salt weight
Magnesium per serving250, 300 or 500 mgExamples for the brand; amounts above 350 mg are checked against the upper intake level
FormatTablet or liquidCapsule and gummy are separate projects
Add-onsVitamin K2, zinc, boronEach addition moves the tablet weight and the vitamin D uniformity plan

The pilot run confirms compression behavior at the full salt load, vitamin D content uniformity at microgram level, liquid solubility and taste, and the content assay of the three actives in the first units against the labeled amounts.

Flavor Options

FormatSuggested FlavorsWhy
LiquidOrange, vanilla, berryMild fruit and cream profiles cover the chalky and bitter note of mineral salts

Technical Status & Data Sources

ItemStatusDetails
Reference formulaNIH DSLDThe ingredient and amount come from a labeled product in the NIH DSLD (vitamin D 10 mcg, calcium 1000 mg and magnesium 500 mg on the label of CF000904, a four-tablet serving; example DSLD labels 6423, 28263, 67718). The label names the three actives by vitamin and element; vitamin D3, calcium carbonate and magnesium oxide are set as the forms.
SpecificationSet in formulationVitamin D3, calcium carbonate and magnesium oxide, per serving 10 mcg vitamin D, 1,000 mg calcium and 500 mg magnesium; assay, particle size and heavy-metal limits and method are fixed with the supplier. Unit size, fill weight and stability are set in formulation.
Data sourceNIH DSLDDSLD v9.4.0, downloaded 2026-01-10: 50,824 reference formulas merged from on-market labels with complete ingredient amounts. Counts show how labels are distributed.
Market reviewPer marketDose limits, labeling and claims are reviewed for each sales market before a finished product is developed.
ReferencesSources[1] Ross AC, Manson JE, Abrams SA, et al. The 2011 report on dietary reference intakes for calcium and vitamin D from the Institute of Medicine: what clinicians need to know. J Clin Endocrinol Metab. 2011;96(1):53-8. DOI · PubMed<br>[2] Capozzi A, Scambia G, Lello S. Calcium, vitamin D, vitamin K2, and magnesium supplementation and skeletal health. Maturitas. 2020;140:55-63. DOI · PubMed<br>[3] NIH Office of Dietary Supplements. Magnesium: Fact Sheet for Health Professionals. Source

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