Understand the rules
In the U.S., dietary supplements don’t need FDA approval before sale. Manufacturers are responsible for safety and labeling, so quality varies.
Read the Supplement Facts panel
- Check the serving size and amount per serving.
- Compare amounts to established upper limits where they exist.
- Be cautious with “proprietary blends” that hide individual amounts.
Look for third-party testing
Seals from independent testing programs (such as USP or NSF) indicate a product was tested for identity and contaminants — not that it works.
Watch for interactions
Some supplements interact with prescription medications or affect surgery and lab tests. Tell your doctor and pharmacist what you take.
Spot red flags
Claims to cure diseases, “miracle” results, or pressure to buy now are warning signs.
Food first
For most people, a varied diet covers most needs. Ask a professional whether a supplement fills a real gap for you.