Vitamin B12 & Folate

Vitamin B12 and folate reference formula at example amounts of 1 mg and 400 mcg per serving, developed as a tablet or capsule.

Vitamin B12 & Folate is a reference formula for brands building a two-vitamin B-complex product around example amounts of 1 mg (1,000 mcg) of vitamin B12 and 400 mcg of folate per serving, and the brand sets the final amounts for its market. Both actives are dosed in micrograms to milligrams, so the development work centers on blend uniformity of two small charges, the choice of B12 and folate forms, and how the two amounts relate to each other on the label.

Tablet is the lead format because two premixes compress into one small unit, and a capsule version carries the same premixes in a standard fill. The reference labels spread across many B12 and folate combinations, and many state folate in mcg DFE, so the amounts here are examples rather than a standard.

Ingredient Composition

IngredientPer ServingRaw Material FormAlternative Form (same amount of active)
Vitamin B121 mg (example amount)Cyanocobalamin as a premix on a carrier, specified on vitamin B12 content; 1,000 mcg vitamin B12 per servingMethylcobalamin as a separate specification, with the input recalculated to the declared amount of vitamin B12
Folate400 mcg (example amount)Folic acid as a premix on a carrier, specified on a folic acid basis; 400 mcg folate per servingL-methylfolate calcium, with the input recalculated to the declared amount of folate

Amounts are stated as mg or mcg of the vitamin itself. Cyanocobalamin is C63H88CoN14O14P, 1355.4 g/mol, and methylcobalamin is C63H91CoN13O14P, 1344.4 g/mol; folic acid is C19H19N7O6, 441.4 g/mol (PubChem CID 135398658) and L-methylfolate calcium is C20H23CaN7O6, 497.5 g/mol (CID 135564391). Labels that state mcg DFE (dietary folate equivalents) follow a separate labeling convention and are kept apart from mcg of folic acid; no conversion is applied on this page.

Intended Benefits & Formula Rationale

This formula is designed for products positioned around daily B-vitamin intake and energy nutrition. Vitamin B12 and folate are included together so that one serving carries both vitamins and the ratio between them can be set by the brand.

Intended Benefit DirectionKey IngredientsFormulation Rationale
Daily folate intakeFolateIncluded as an essential micronutrient and cofactor in one-carbon metabolism that mammals cannot synthesize [1]. Evidence: Referenced
Joint B12 and folate statusVitamin B12, FolateA review reports that cognitive test scores are lower and homocysteine and methylmalonic acid concentrations are higher in people with low B12 and elevated folate than in people with low B12 and nonelevated folate, with evidence that is mainly correlative [2]. Evidence: Mixed

The amounts are examples, and the ratio of B12 to folate is a design decision. The review in [2] discusses how high folic acid intake can mask or worsen B12 deficiency, so the amount of each vitamin, the label wording and the target market are reviewed together for each sales market.

Available Formats

The vitamin B12 and folate reference formula is built for a tablet version and a capsule version; counts per serving are design choices that the brand can adjust.

FormatUnitPer ServingPack SizeOther Ingredients (typical)Suitability
Tablet1 tabletVitamin B12 1 mg, folate 400 mcg60 or 90 tabletsMannitol, vegetable cellulose, stearic acid, vegetable magnesium stearate, silica, steviaLead format; small unit with two premixes
Capsule1 capsuleVitamin B12 1 mg, folate 400 mcg60 or 90 capsulesCellulose, flow agent, vegetable capsule shellTwo premixes in a standard fill

Raw Material Input & Fill (Design Estimate)

Design estimates. The inputs are the labeled amounts divided by the assumed assay of each raw material: cyanocobalamin and folic acid are each carried in a 1% premix on a carrier, so 1,000 mcg of vitamin B12 needs 100 mg of premix and 400 mcg of folate needs 40 mg of premix per unit.

FormatRaw Material Input per UnitDesign FillBalance for ExcipientsVerification Before Scale-Up
TabletB12 premix 100 mg, folate premix 40 mg250 mg tablet weight110 mgContent uniformity of both vitamins, hardness, disintegration, content assay
CapsuleB12 premix 100 mg, folate premix 40 mg220 mg per capsule80 mgBlend uniformity of both vitamins, fill weight variation, content assay

Liquid, powder and gummy versions are separate projects, because two light-sensitive vitamins in a dissolving or chewable system need their own stability work.

Formulation Considerations

Two micro-charges in one blend. At 140 mg of premix in a 250 mg tablet, the two vitamins sit in separate premixes, and the blending order matters. Content uniformity of both vitamins across the first units decides whether the premix dilutions hold.
B12 and folate forms. Cyanocobalamin and methylcobalamin differ in structure and weight, and folic acid and L-methylfolate differ in weight and stability. The review in [1] describes 5-methyltetrahydrofolate as well absorbed even when gastrointestinal pH is altered, so each form is stated on the formula and the label.
Folate and B12 balance. The review in [2] links high folic acid intake with exacerbation of B12 deficiency, and the ratio of the two vitamins is therefore part of the design review, together with label directions for each sales market.
Label units. Many reference labels state folate in mcg DFE, and the two units are not interchangeable without the form and the intake conditions. The unit follows the rule of the sales market, and any conversion factor goes into the specification.

Customization Options

Brands adjust the amount of each vitamin, the vitamin forms, the format and the add-ons.

ParameterRangeNote
Vitamin B12 per serving25 mcg, 1 mg or 2 mgExamples for the brand; premix weight per unit scales with the amount
Folate per serving400 or 800 mcgExamples for the brand; folate unit and form set in the specification
Vitamin formsCyanocobalamin or methylcobalamin; folic acid or L-methylfolateSeparate specifications; weight per unit of active differs
FormatTablet or capsuleLiquid, powder and gummy are separate projects
Add-onsVitamin B6, vitamin C, cholineA third vitamin adds a premix and raises the uniformity check count

The pilot run confirms content uniformity of both vitamins at microgram level, tablet hardness and disintegration, capsule fill weight, and the content assay of vitamin B12 and folate in the first units against the labeled amounts.

Technical Status & Data Sources

ItemStatusDetails
Reference formulaNIH DSLDThe ingredient and amount come from a labeled product in the NIH DSLD (vitamin B12 1 mg and folate 400 mcg on the label of CF001416; example DSLD labels 8922, 237067, 261379). The label names the two vitamins by name; cyanocobalamin and folic acid are set as the forms.
SpecificationSet in formulationCyanocobalamin and folic acid premixes, per serving 1 mg vitamin B12 and 400 mcg folate; assay, premix dilution and 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] Scaglione F, Panzavolta G. Folate, folic acid and 5-methyltetrahydrofolate are not the same thing. Xenobiotica. 2014;44(5):480-8. DOI · PubMed<br>[2] Miller JW, Smith A, Troen AM, et al. Excess Folic Acid and Vitamin B12 Deficiency: Clinical Implications? Food Nutr Bull. 2024;45(1_suppl):S67-S72. DOI · PubMed

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