Where peptides stand legally
Each peptide page shows a few status labels at the top. Here's what each one means. This is a plain-English guide, not legal advice.
FDA-approved
A specific product passed FDA review for a specific use (see Research peptide vs. approved drug). You get it with a prescription from a pharmacy. Only a few peptides are in approved medicines, for example semaglutide (Ozempic, Wegovy), tirzepatide (Mounjaro, Zepbound) and tesamorelin (Egrifta).
Compoundable
A compounding pharmacy mixes a medicine for one patient from a prescription. It can't use just any ingredient. For most pharmacies (called 503A pharmacies), an ingredient generally has to be part of an approved drug, have an official USP quality standard, or be on the FDA's list of allowed bulk substances. While that list is being built, the FDA sorts nominated ingredients into categories:
| Category 1 | Under review, and pharmacies may use it in the meantime. |
| Category 2 | Flagged for possible safety concerns. Pharmacies shouldn't use it. |
| Category 3, or never nominated | Not enough information submitted, or no one asked. Generally can't be compounded. |
These lists change. In 2026 the FDA took several research peptides, including BPC-157, off Category 2, which removed a barrier but didn't approve anything. Each peptide page says where that peptide stands and when we last checked.
Research use only
A chemical sold to labs for study. It isn't a drug, a supplement or a treatment, and it can't be sold as one. That's how every product in our store is sold, and it's why Learn never gives doses or usage instructions.
Prohibited in sport
The World Anti-Doping Agency (WADA) publishes a list of substances banned for tested athletes. It includes a catch-all class, S0 Non-approved substances, covering anything not approved for human use by any government, so most research peptides are covered. Some also fall under named classes, such as growth hormone releasing factors. If you're a tested athlete, assume a research peptide is banned unless you've confirmed otherwise.
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Last read: how to tell whether what's in a vial is what the label says: Quality, purity and COAs.