Where they come from
Same molecule, four very different worlds.
The lane a compound is in decides how it was reviewed, who can get it, and who is accountable if something goes wrong. Here is which compound lives in which lane, and what that lane actually looks like in real life.
FDA Approved
A physician writes a prescription and a licensed pharmacy fills the branded drug. The FDA reviewed years of trial data, and someone is legally accountable at every step. This is the version with a full paper trail.
Prescribed broadly
Approved, but only for a rare disease
Compounding Pharmacy
A specialized physician with access to a 503A compounding pharmacy writes the script, and the pharmacy makes it for you specifically. It is legal and monitored, but it has not gone through the full FDA approval process.
Legal with a prescription
Approved abroad, not in the US
Legally prescribed in another country, but with no US or EU approval. Inside the US, that puts it in the same unregulated space as the grey market below.
Prescription drugs elsewhere
Grey Market
Sold online as research chemicals, not for human use, outside the FDA framework entirely. No prescription, no accountability, quality varies by vendor. This is where most of the peptide conversation actually happens, and where verifying what you bought matters most.
Research chemicals, sold to anyone
Many of these (BPC-157, TB-500, GHK-Cu, KPV, LL-37, MOTS-c, Epitalon, Melanotan II) are facing removal from the compounding Category 2 list, pending PCAC review. The rules here are actively changing.
One to watch: Retatrutide is not approved yet. It is still in Phase 3 trials. If it clears, it moves straight into the FDA Approved lane at the top.
The further down the lanes you go, the less anyone is accountable for what is in the vial. If you are buying grey-market, learn to verify it first.
Daily Peptide is independent. Educational, not medical advice. Never what to take, how to take it, or where to get it.