Weight Loss Supplements FAQs: What’s the Difference Between a Supplement and a Medicine?

A medicine (drug) goes through DRAP’s full drug registration process and, for prescription drugs, requires a doctor’s prescription to obtain. A dietary supplement is processed under a separate enlistment pathway, is available without a prescription, and faces different (generally more limited) rules on what claims it can make.

No. Legitimate supplements are limited to describing how ingredients support the body’s normal structure or function — language like “supports fat metabolism” — not disease-treatment claims like “treats” or “cures,” which are reserved for registered drugs that have gone through the evidence and approval process required to make them.

Prescription medicines for weight loss (like GLP-1 injections or orlistat) are generally backed by larger, more rigorous clinical trials and tend to produce larger average effects than supplements. That doesn’t make every medicine appropriate for every person, or every supplement ineffective — it’s a difference in evidence scale and regulatory oversight, not a simple effectiveness ranking.

This is a red flag worth taking seriously — a genuine supplement’s marketing should stay within “supports/may help” language. Claims that mimic a prescription drug’s specific mechanism or promised outcome are overstepping what the supplement category is legally allowed to claim.

Yes. Even non-prescription supplements can interact with medications in some cases, so your doctor should have the full picture of everything you’re taking, not just prescribed items.