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Glossary

What is a vitamin overage?

Written by the Full Measure editorial team, which sells supplements. Approved for publication by the Full Measure owners. Updated .

Drafted with AI assistance from the sources listed below. How we write these

Quick answer

An overage is extra of an ingredient added during manufacturing, above the amount on the label, so the product still meets its label as the ingredient breaks down over its shelf life. FDA's rule requires the master manufacturing record to state any intentional overage (21 CFR 111.210(e)), and labeling rules accept reasonable excesses.1,2,3

Key facts

  • FDA said an overage should be limited to the amount needed to meet the declared amounts.2
  • The final rule asks makers to state the overage in the master manufacturing record, not to explain why it was added.1,2
  • Overages are not standardized: researchers predict overages above 20% for several nutrients in 50% to 99% of multivitamins reported in a national survey.4
  • In a lab study of vitamin powder blends, thiamin and vitamin C broke down faster at high humidity, and vitamin C sped up the loss of thiamin.5

Why makers add overages

Some ingredients lose strength between manufacture and the end of shelf life. FDA acknowledged in 2007 that firms add extra of certain ingredients so the product meets its specification for the whole expected shelf life.2

How much is lost depends on the ingredient, the formula and the storage. Researchers studying vitamin blends describe stability data as what makers need to meet label claims and to choose appropriate overages.5

How overages show up in testing

Because of overages, products often test above 100% of their label. In U.S. adult multivitamins, average measured amounts were 1.5% to 13% above the label for many nutrients, and about 25% above for selenium and iodine.6

That matters for anyone adding up intake. Researchers behind the U.S. Dietary Supplement Ingredient Database adjust label values upward, because labels can understate what people actually get.4

The rules that apply

  • Master manufacturing record: must include a statement of any intentional overage of a dietary ingredient.1
  • Labeling: reasonable excesses over the declared amount are acceptable within current good manufacturing practice.3
  • Minimums: an added nutrient must be present at no less than its declared amount, so an overage also keeps a product above that floor.7

Overages and total intake

Overages add to what you take in. The authors of the national multivitamin study noted that most products already meet recommended intakes, so the extra from supplements on top of food may have unintended effects, though that needs more study.6

Questions people ask

What is an overage statement?

It is the written statement of any intentional overage that FDA requires in a supplement's master manufacturing record. It records how much extra is added, not why.1,2

Is an overage the same as a high dose?

No. An overage is a margin above the labeled amount, meant to keep the product at its label through its shelf life. The labeled dose is a separate decision.2

Do all makers use the same overage?

No. Researchers at USDA and NIH report that overages are not standardized across manufacturers.4

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Sources

  1. 21 CFR 111.210. What must the master manufacturing record include? Opened 2026-10-07.
  2. Food and Drug Administration. Current Good Manufacturing Practice in Manufacturing, Packaging, Labeling, or Holding Operations for Dietary Supplements; Final Rule. Federal Register 72 FR 34752, June 25, 2007. Opened 2026-10-07.
  3. 21 CFR 101.36. Nutrition labeling of dietary supplements. Opened 2026-10-07.
  4. Andrews KW, Gusev PA, McNeal M, et al. Dietary Supplement Ingredient Database (DSID) and the application of analytically based estimates of ingredient amount to intake calculations. J Nutr. 2018;148(suppl 2):1413S-1421S. Opened 2026-10-07.
  5. Hiatt AN, Ferruzzi MG, Taylor LS, Mauer LJ. Impact of deliquescence on the chemical stability of vitamins B1, B6, and C in powder blends. J Agric Food Chem. 2008;56(15):6471-6479. Opened 2026-10-07.
  6. Andrews KW, Roseland JM, Gusev PA, et al. Analytical ingredient content and variability of adult multivitamin/mineral products: national estimates for the Dietary Supplement Ingredient Database. Am J Clin Nutr. 2017;105(2):526-539. Opened 2026-10-07.
  7. 21 CFR 101.9(g). Nutrition labeling of food: how compliance is determined. Opened 2026-10-07.

This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.