MineralsNutrition Facts Core Nutrient

Iron

Iron: adult/children 4+ Daily Value reference 18 mg. Confirm the product amount and applicable declaration conditions.

FDA Reference Data

RDI (Adults 4+)

18 mg

Unit

Supplement Facts Declaration

Depends on ingredient and amount

Regulation

21 CFR 101.36

Supplement Facts: declaration depends on the ingredient and amount per serving (21 CFR 101.36). For (b)(2) nutrients, confirmed absent or zero-declarable amounts must be omitted. Missing data is unknown, not zero. Nutrition Facts food-label rules are separate.

Sample Supplement Facts for Iron

Supplement Facts

Serving Size 1 capsule

Servings Per Container 30

Amount Per Serving% Daily Value

Iron18 mg 100%

Ferrous Bisglycinate—

* The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet.

Illustrative sample — format generated by ReguSift per 21 CFR 101.36.

Review a Supplement Facts draft with Iron.

Upload a specification or COA containing declared amounts per serving. AI extracts available values; compare the amount, unit and source form with your document before confirming. This illustrative panel is not evidence of a suitable dose or a compliant finished package.

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About Iron

Iron declaration on Supplement Facts depends on the amount per serving and applicable conditions in 21 CFR 101.36(b)(2). Confirmed absent or amounts below the applicable declaration threshold must be omitted; missing information is unknown, not zero. The adult/children 4+ reference is 18 mg. Select the intended population before calculating %DV. For minerals, use the confirmed elemental amount rather than the whole salt weight. Nutrition Facts follows separate food-label declaration rules.

Common Supplement Forms

Ferrous Bisglycinate

Identity example. Verify the exact form and amount basis against your supplier specification; do not infer effectiveness, dose or conversion from the form name.

Elemental

20%

Ferrous Fumarate

Identity example. Verify the exact form and amount basis against your supplier specification; do not infer effectiveness, dose or conversion from the form name.

Elemental

33%

Ferrous Sulfate

Identity example. Verify the exact form and amount basis against your supplier specification; do not infer effectiveness, dose or conversion from the form name.

Elemental

20%

Ferrous Gluconate

Identity example. Verify the exact form and amount basis against your supplier specification; do not infer effectiveness, dose or conversion from the form name.

Elemental

12%

Note: When a salt form is used, the Supplement Facts panel must declare the elemental amount (e.g., “Magnesium 141 mg 34%”), not the salt weight. The salt name appears in the ingredient list below the panel. See %DV calculator for calculation details.

Reference sources and scope

Adult/children 4+ reference values: 21 CFR 101.9(c). Supplement declaration conditions: 21 CFR 101.36(b). Ingredient identity and botanical naming: 21 CFR 101.4. Reference links checked 20 October 2026.

Form names are identity examples. They do not establish product amounts, ingredient permissibility, health effects or a recommended dose. Confirm your exact specification and intended population.

Frequently Asked Questions

What source amount should I use for Iron?

Use your product’s confirmed declared amount per serving, with units and a clear source basis. A raw-material weight is not automatically the finished-product declared amount. Request missing values from the source owner.

What is the adult Daily Value reference for Iron?

The adult/children 4+ reference for Iron is 18 mg. Other populations can have different reference values; confirm the intended population before using this number.

How should missing Iron data be handled?

Missing data remains unknown. Confirm the amount before deciding whether a Supplement Facts row reaches the declaration threshold or must be omitted. Do not fill an unknown amount with zero.

How do I check the form of Iron?

Compare the exact form in the manufacturer’s specification with the source identity and serving declaration. Forms listed here are identity examples, not recommendations or a guarantee of interchangeability. Confirm any conversion using the exact chemical form and supplier assay.