A reference you can trust in front of a patient.

The peptide space is loud, fast-moving, and full of marketing dressed up as medicine. 503MD exists to cut through it: one place where every compound carries its real regulatory standing, the strength of its human evidence, and a clear 503A/503B status — in plain English, cited to primary sources.

We profile 74 compounds, 65 of them with catalogued human studies linked to PubMed. Each is sorted into a tier (where it stands) and an evidence grade (how good the data is), kept deliberately separate so neither hides behind the other.

503MD is a reference and a provider gateway — not a pharmacy. For licensed providers, it's also the door to a portal that brings your orders together across fulfillment programs. 503MD is an educational reference only. Nothing here is a prescription, an offer to dispense, or a substitute for clinical judgment. Regulatory status is tracked as of the date shown on each compound page and can change.