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Evaluating Safety Claims

Evaluating safety claims: a checklist for judging safe, natural, clinically tested and detox claims, using NIH guidance on supplement claims, journal articles and product differences.

Content last updated . This page has not been medically reviewed.

Questions to ask

  1. Who is making the claim? A seller, an influencer or a health agency? NIH notes strong evidence behind claims is often lacking: a 2022 review of 27 ingredients promoted for immune function looked for rigorous human studies of each. [1]
  2. Was it tested in people, and in people like you? Many supplements have not been tested in pregnant women, nursing mothers or children. [1]
  3. Was it this exact product? Supplements you buy may differ in important ways from products tested in studies. [1]
  4. Is "safe" based on a study or on tradition? Natural does not always mean safe. [1]
  5. What kind of claim is it? Disease claims are for drugs; structure/function claims carry the FDA disclaimer. [1]
  6. Is it a single study? NIH has guidance on how to read a scientific journal article. [2]
  7. Does it say it is "standardized", "verified" or "certified"? That does not necessarily guarantee quality. [1]
  8. Does the claim include a cure, detox or "no side effects"? Treat these as warning signs; see our claim checks for foods.

Evidence labels we use

Documented, reported, preliminary, theoretical, and proper evidence not found. See How interactions work.

Advertising

The Federal Trade Commission requires advertising to be truthful and not misleading. [1]

References

  1. National Center for Complementary and Integrative Health (NIH). Using Dietary Supplements Wisely. Read 2026-10-22.
  2. National Center for Complementary and Integrative Health (NIH). Know the Science: How To Make Sense of a Scientific Journal Article. Read 2026-10-22.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.