Verify an Online Health Claim Before You Buy

By NHINWatch.com Investigations Desk | Reviewed August 13, 2026

NHINWatch is an independent scam-investigation newsroom. We are not a clinic, regulator, law firm, law-enforcement agency, or emergency service. This checklist helps you evaluate health claims before you spend money or trust a product.

Step 1: Write Down the Exact Claim

Health claims come in layers. A company might say a product “supports energy,” “boosts immunity,” or “helps you lose weight.” Each phrase means something different. Write down the exact words used in ads, labels, or testimonials.

Ask yourself: Is the claim specific or vague? Does it promise a cure, or does it say “may help” or “supports”? Cures and guarantees are red flags. The FDA does not allow companies to claim a supplement or unproven product cures, treats, or prevents disease.

Step 2: Climb the Evidence Ladder

Not all evidence is equal. The strongest evidence comes from large, independent studies published in peer-reviewed journals. The weakest comes from testimonials, celebrity endorsements, or before-and-after photos.

Strongest: Multiple large studies in humans, published in peer-reviewed medical journals, showing the product works better than a placebo.

Moderate: One or two published studies, or studies funded by the maker but conducted by independent researchers.

Weak: Lab studies, animal studies, or small human studies with no control group.

Weakest: Testimonials, before-and-after photos, celebrity claims, or “ancient wisdom” with no modern testing.

If the seller cannot point you to published studies, or if studies exist but were funded only by the company, treat the claim as unproven.

Step 3: Check the Label Against the Claim

The label is the legal document. If the ad says the product “cures arthritis” but the label says “supports joint health,” that mismatch is a warning sign. Labels must list active ingredients, dose, and warnings.

Ask: Does the label match the ad? Are ingredients listed by name and amount? Are there warnings for pregnancy, children, or drug interactions? If the label is missing, incomplete, or in poor English, be cautious.

You can search the FDA’s database of dietary supplement ingredients at FDA.gov to verify what is known about each ingredient.

Step 4: Identify the Seller

Who is actually selling this product? Does the checkout name the same business shown in the terms and contact page? Can you confirm its address, support method, and any claimed registration through an appropriate official record?

Warning signs include no company name, no working support route, or terms that name a different seller. A P.O. box or private domain record is not proof of deception.

Judge the full set of facts. Write down what is still unknown.

Check whether the seller has faced FDA warning letters or FTC enforcement actions. The FTC’s health-products guidance lists common violations.

Step 5: Look for Official Endorsement or Warning

Has the FDA, FTC, or your state health department issued a warning about this product or company? Search the FDA’s health-fraud page and the FTC’s fraud-report database.

The FDA does not approve dietary supplements before sale in the same way it approves drugs. Do not treat the absence of a warning letter as proof that a product is safe or effective. Check what kind of product it is and what regulatory claim the seller actually makes.

Step 6: Evaluate the Price

Unusually cheap prices may mean low-quality ingredients or counterfeit products. Unusually high prices may mean you are paying for marketing, not science. Compare prices across sellers and check whether the dose matches.

Be skeptical of “limited-time offers,” “exclusive deals,” or pressure to buy now. Legitimate products are available consistently at fair prices.

Step 7: Know Where to Report and Get Help

If you have a bad reaction, report it to the FDA’s MedWatch program. If you believe you were scammed, report it to the FTC or the FBI’s Internet Crime Complaint Center.

Keep receipts, photos of labels, and copies of ads. These help investigators and protect other consumers.

What to Do Next

If a claim fails the checklist, do not buy. If you are unsure, talk to your doctor or pharmacist before using any new product, especially if you take other medicines or have a health condition.

Learn more about how we investigate online health scams, what to do after an online health scam, and our editorial standards.

For guidance on evaluating online health resources, see the National Center for Complementary and Integrative Health.

This page was reviewed August 13, 2026. Health-fraud tactics and products change. Check back for updates.