Declaring Magnesium on a Beverage Label With Nutrition Facts or Supplement Facts

A beverage brand should settle the product category before its designer builds the facts panel. A conventional beverage follows the Nutrition Facts rules in 21 CFR 101.9. A liquid dietary supplement follows the Supplement Facts rules in 21 CFR 101.36. The ingredient alone does not decide the category, and printing “Supplement Facts” on a bottle does not make an ordinary beverage a dietary supplement.

For both routes, magnesium means elemental magnesium, not the weight of the magnesium glycinate or other source used to make the product. The important differences are how the product is represented, how serving size is established, where source ingredients are named and how the percentage Daily Value is rounded.

Liquid dietary supplement vs beverage starts with product positioning

FDA's guidance on distinguishing liquid dietary supplements from beverages considers product and brand names, packaging, serving size, recommended daily intake, composition, directions for use, advertising and other marketing practices. It is guidance explaining FDA's thinking, not a separate binding classification rule.

A product sold and presented as a conventional drink does not become a supplement because magnesium was added. Conversely, liquid form does not prevent a product from being a dietary supplement when it meets the applicable definition and is not represented for use as conventional food. Some representations can be decisive; in other cases FDA considers a combination of factors.

For a magnesium beverage formulation project, put the proposed name, container, serving directions, website copy and intended use into the same review. Do this before approving packaging artwork. Do not leave the regulatory team to reconcile beverage-style marketing with a supplement panel after the formula has been locked.

What changes between the two facts panels

The comparison assumes the standard population, not a product specifically represented for infants, younger children, pregnancy or lactation. Those categories have different reference values. It also does not replace the rest of the panel: calories, sugars, sodium and other required declarations still follow the relevant route.

Declaring magnesium in Nutrition Facts

Under 21 CFR 101.9(c)(8), magnesium is not one of the four vitamins and minerals routinely required on the standard panel. It becomes a required declaration when added as a nutrient supplement or when a claim is made about it, subject to the provisions in that section. Naturally occurring magnesium may also be declared voluntarily.

The regulation distinguishes the required percent-DV declaration for these additional minerals from the quantitative weight declaration. A brand can include the magnesium amount in milligrams along with its percent DV. That is the format used in the example below; do not assume the quantitative weight is universally mandatory for every additional mineral in Nutrition Facts.

Keep the nutrient name as “Magnesium.” The ingredient statement identifies the magnesium source by its common or usual name, following 21 CFR 101.4. Do not copy the Supplement Facts source-parenthesis convention into Nutrition Facts as though the two formats were interchangeable.

For magnesium fortified beverages, serving size must follow the applicable reference amount and package rules in 101.9(b) and 101.12. A brand cannot choose a smaller serving just to obtain a preferred magnesium declaration. Individually sold packages may require whole-container labeling or dual columns, depending on the applicable rules.

Declaring magnesium in Supplement Facts

21 CFR 101.36(b)(2) requires the quantitative amount to represent the dietary ingredient rather than its source. For magnesium, that is the weight of elemental magnesium. The vitamin and mineral amount uses the units and significance specified in 101.9(c)(8)(iv), and the magnesium percent DV is expressed to the nearest whole percent.

Section 101.36(d) allows the source to be identified in parentheses immediately after, or indented beneath, the nutrient name, preceded by “as” or “from.” For example, a product whose actual source is magnesium glycinate can use “Magnesium (as magnesium glycinate).” If the source is identified there, it need not be repeated in the ingredient statement. If it is not identified there, it must be listed outside the panel as required by that section and 101.4(g).

If two magnesium sources supply the nutrient, identify both when using this parenthetical format, in descending order by weight of the source ingredients. A brand name alone is not a replacement for the common or usual source name.

Supplement serving size follows 101.36(b)(1) and the applicable provisions of 101.12. For supplements, the reference amount is the maximum amount recommended per eating occasion, or one unit if there is no recommendation. Do not automatically transfer the serving size from a conventional beverage to a supplement version.

Our elemental magnesium label guide covers the supplement-focused calculation in more detail. This article adds the category and conventional-food decisions a beverage brand needs before using that calculation.

The same 100 mg produces different percent DV declarations

Consider a hypothetical finished serving containing exactly 100 mg of elemental magnesium, with the standard 420 mg Daily Value. This is a label-calculation example, not a proposed use level.

The unrounded percentage is 100 divided by 420, multiplied by 100, or about 23.81%.

For Nutrition Facts, 101.9(c)(8)(iii) requires vitamin and mineral percentages in the nearest 2-percentage-point increments through 10%, 5-point increments above 10% through 50%, and 10-point increments above 50%. For Supplement Facts, 101.36(b)(2)(iii) uses the nearest whole percent. That is why the same magnesium quantity can have a different printed percentage.

For supplement magnesium, calculate the percentage from the unrounded amount, not an already rounded milligram display. Keep the underlying calculation and the artwork value in separate fields so a spreadsheet does not silently apply one panel's rounding to both products.

Connect the ingredient specification to the finished drink

The formulation worksheet and the facts panel describe different quantities. The worksheet records how much source ingredient goes into a batch. The facts panel reports how much elemental magnesium is in a serving of the finished product.

As an arithmetic example, 1,250 mg of a hypothetical ingredient assayed at 8.00% elemental magnesium contributes 100 mg magnesium before accounting for other sources and the actual finished-product result. That is not a statement that every magnesium glycinate ingredient contains 8.00%, nor does ingredient weight establish the final label claim by itself.

When using a mineral premix for beverages, obtain the elemental contribution from the premix specification and account for magnesium supplied by other ingredients. Do not declare only the added portion if the finished product contains additional magnesium. Our elemental magnesium and ingredient weight page separates these calculations.

For nutrient compliance, 101.9(g) distinguishes added Class I nutrients from naturally occurring Class II nutrients. When an external magnesium source is added, the combined naturally occurring and added magnesium is subject to the Class I requirements. Do not apply the Class II 80% criterion as a general allowance for an under-strength fortified product. Section 101.36(f) incorporates the relevant compliance framework for supplements, with its specified sampling provisions.

Include the declared magnesium level in the finished-product specification and in magnesium beverage shelf life testing. Ingredient assay, batch addition, fill volume and a representative finished-product analysis should tell a consistent story. The pH and heat stability testing guide covers the formulation tests separately from the panel decision.

The label handoff for brand owners and co-packers

Send the artwork team a controlled brief with the product category, the rule supporting serving size, target population, elemental magnesium per serving, unrounded percent-DV calculation, rounded display value and common or usual ingredient names. Include the full formula's other required nutrient declarations rather than an isolated magnesium row.

Ingredient suitability is a separate decision from panel format. Evidence supporting an ingredient for dietary supplement use does not automatically establish its lawful use in a conventional beverage. FDA's liquid-product guidance addresses the differing ingredient requirements as well as labeling. Resolve intended-use suitability before the label is approved.

Before release, compare the approved formula, source specification, finished-product specification and final artwork. A change in source composition, premix strength, serving size or product positioning can require more than changing a single number.

MagneINNO™ magnesium glycinate is supplied by NutraINNO USA Inc., the U.S. company behind the MagneINNO brand, and is built on proprietary MagniLift™ technology. Request technical documentation and a formulation discussion to connect ingredient selection with your beverage development brief.