How to Check a Supplement Seller’s Credentials
Verify the business identity and published terms; do not confuse FDA facility registration, advertising claims, or affiliate domains with product approval.
Start with the company identity
Locate the seller’s contact page, shipping and refund terms, and checkout merchant details. A trustworthy transaction should clearly tell you who takes payment, who fulfils the order and who handles problems. Save copies of terms in case wording changes later.
What FDA registration means
Some supplement sellers emphasize that their product is made in an FDA-registered facility. Facility registration is not the same as FDA approval of a specific dietary supplement, nor proof that marketing claims are clinically supported. The FDA generally does not preapprove dietary supplements for effectiveness.
Check claims independently
A web page can reproduce the product label, but it cannot certify the ingredient identity or amount without underlying evidence. Product statements, reviews and promotional photographs should be identified as seller-reported unless validated. Be particularly skeptical of claims that a supplement cures an enlarged prostate.
When using affiliate websites
An independent affiliate can provide helpful context and comparison while receiving commission for qualifying purchases. The relationship must be disclosed clearly. Check the final destination before buying and consult the actual seller for the current price and policy conditions.
Questions worth asking
What does the original source actually establish? Is the information about a particular ingredient or about a finished multi-ingredient supplement? Has the source studied the same dose, population and outcome that a marketing claim implies? Keeping these distinctions clear is more useful than relying on product reputation alone.
Sources & verification
External sources support the points identified in the article; seller marketing is labeled separately from independent health evidence.