National Center for Complementary and Integrative Health (NCCIH)
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Dietary and Herbal Supplements

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Woman comparing two dietary supplement bottle in a store

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A dietary supplement, as defined by the Dietary Supplement Health and Education Act (DSHEA), is a product that:

  • Is intended to supplement the diet
  • Contains one or more dietary ingredients (including vitamins, minerals, herbs or other botanicals, amino acids, and certain other substances) or their constituents
  • Is intended to be taken by mouth, in forms such as tablet, capsule, powder, softgel, gelcap, or liquid
  • Is labeled as being a dietary supplement.

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This page last modified January 26, 2018