Understand the critical differences between FDA-approved peptide drugs, compounded peptide products, and unauthorized "research" peptides sold online.
Filed under safety quality, written for beginner, patient-consumer, clinician, regulator-compliance, evidence level risk-flag.
Not medically reviewed. Last updated 2026-04-20. Nothing here is medical advice.
The peptide landscape includes a spectrum from rigorously approved medicines to unregulated products sold online. Understanding these distinctions is essential for safety and informed decision-making.
These are drugs that have passed Phase I–III clinical trials and received marketing authorization from agencies like the FDA, EMA, or Health Canada. Examples include semaglutide (Ozempic/Wegovy), liraglutide (Victoza/Saxenda), and calcitonin gene-related peptide (CGRP) antagonists for migraine.
Approved peptide medicines are:
Compounded drugs are prepared by pharmacies under Section 503A or 503B of the Federal Food, Drug, and Cosmetic Act. They are not FDA-approved, meaning the FDA has not verified their safety, effectiveness, or quality before they are marketed.
Products labeled "for research use only" or "not for human consumption" are intended for laboratory research. They are not manufactured under pharmaceutical GMP standards and are not tested for safety in humans. Using these products carries significant risks including contamination, incorrect dosing, and unknown purity.
Health Canada has specifically warned consumers about unauthorized injectable peptide drugs promoted online. The FDA has also taken enforcement action against companies marketing unauthorized GLP-1 products.
This guide does not recommend, rank, or direct readers to any specific products or suppliers.
More guides: All guides, Safety centre, Peptide library.