Dose math guide

Supplement serving-size traps: scoops, gummies, and label math

The hardest part of many labels is not ingredients. It is how many of them you are supposed to take at once.

Last reviewed: 2026-06-03Focus: serving size, scoops, gummies, dosing units

For research and educational purposes only. Not medical advice.

The quick read

FDA labeling guidance requires serving size and serving units to be clear on the label. FDA dietary supplement labeling guide FDA changes to the Nutrition Facts label
If a label uses a unit (for example, 1 scoop or 2 gummies), NutriScore checks should scale claims to that serving unit. FDA changes to the Nutrition Facts label FDA supplement claim substantiation guidance
If the promised effect implies daily use, confirm what the math looks like across one and more servings. FTC health products compliance guidance FDA supplement claim substantiation guidance
Format does not prove efficacy. It only changes how easy the dosing habit is. FDA 101 dietary supplements

Serving size is the core unit of label math. If serving math is unclear, a dosage claim is hard to audit. FDA dietary supplement labeling guide FDA changes to the Nutrition Facts label

Powders and gummies are still judged by amount per serving. If you cannot identify that amount, you are guessing. FDA dietary supplement labeling guide FDA 101 dietary supplements

A 'serving' may be two scoops, multiple gummies, or one tablet. The difference can be a multiple in dose. FDA changes to the Nutrition Facts label FDA dietary supplement labeling guide

If a claim scales to a day of use, audit whether one serving is the practical starting dose or marketing shorthand. FTC health products compliance guidance FDA supplement claim substantiation guidance

Prioritize labels that use single-serving amounts in plain units and repeat those amounts consistently across all ingredient claims. FDA dietary supplement labeling guide FDA changes to the Nutrition Facts label

Weak labels push the daily-dose decision to the user without giving enough math to make that decision responsibly. FDA 101 dietary supplements FTC health products compliance guidance

Count what one serving actually is before you judge the formula.

Multiply through to daily use if the label claims daily outcomes.

Use serving size, not marketing claims, when comparing cost-per-serve or duration.

FDA dietary supplement labeling guide: https://www.fda.gov/food/dietary-supplements-guidance-documents-regulatory-information/dietary-supplement-labeling-guide-chapter-iv-nutrition-labeling
FDA changes to the Nutrition Facts label: https://www.fda.gov/food/nutrition-food-labeling-and-critical-foods/changes-nutrition-facts-label
FTC health products compliance guidance: https://www.ftc.gov/business-guidance/resources/health-products-compliance-guidance
FDA supplement claim substantiation guidance: https://www.fda.gov/regulatory-information/search-fda-guidance-documents/guidance-industry-substantiation-dietary-supplement-claims-made-under-section-403r-6-federal-food
FDA 101 dietary supplements: https://www.fda.gov/consumers/consumer-updates/fda-101-dietary-supplements

Corrections: send corrections or updated label/source evidence to support@nutriscore.fit.

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