Plain-language explainers
Dietary Supplement Guides
How to read a Supplement Facts panel, what FDA oversight covers under DSHEA, and how to use NIH government data to compare products, without the marketing spin.
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- Ingredients
Disclaimer: This content is for informational purposes only and does not constitute medical advice. Consult a healthcare provider before starting any supplement.
How to Read a Supplement Facts Panel
What every line of a supplement label means, how Daily Value percentages work, and how supplement labels differ from food nutrition facts.
Supplement Safety Basics: What FDA Oversight Really Covers
How the FDA regulates dietary supplements versus drugs, common quality concerns, and what the NIH DSLD data reveals about the industry.
How to Compare Supplements Using NIH Data
A practical guide to using government label data to evaluate brands, check ingredient amounts, and identify quality indicators.
Are Supplements Worth Taking? Evidence-Based Guide
Which supplements have strong scientific evidence, which don't, and how to evaluate claims, including an evidence ratings table for 14 common supplements.
How to Read Supplement Labels (Practical Guide)
Serving sizes, proprietary blends, third-party certifications, Other Ingredients allergens, and botanical label terminology decoded.
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Methodology
Every guide on PlainVitamins references the NIH Dietary Supplement Label Database (DSLD), the federal label database maintained by the Office of Dietary Supplements at the National Institutes of Health.NIH ODS, Dietary Supplement Label Database (DSLD) Guides draw on DSLD label filings for concrete examples (ingredient counts, Daily Value percentages, serving sizes, market status) rather than on manufacturer marketing copy. Daily Value framing follows the FDA's nutrition labeling regulation for adults.
Regulatory framing in every guide follows the Dietary Supplement Health and Education Act (DSHEA), the federal statute that defines what a dietary supplement is, how it is labeled, and the limits of FDA pre-market authority. Ingredient evidence ratings in the "Are Supplements Worth Taking?" guide reference NIH Office of Dietary Supplements Fact Sheets and the peer-reviewed literature those fact sheets cite, ratings are conservative and align with the NIH's own categorization of evidence strength.
Not medical advice. Guides are educational references only. They do not constitute medical, nutritional, diagnostic, or treatment advice. Consult a licensed healthcare provider before starting, stopping, or combining any dietary supplement, especially if you are pregnant, nursing, take prescription medication, or have a medical condition.