FDA
Also known as Food and Drug Administration
The US regulatory body for drugs, devices and compounding pharmacies — the agency that classifies which peptides may be compounded.
Definition
The US Food and Drug Administration regulates pharmaceutical manufacturing, compounding and prescription distribution. For peptides, the key FDA mechanisms are the 503A pathways for compounding pharmacies and the 'bulks list' that determines which substances may be compounded. HHS announced reclassification of ~14 peptides back to compounding-eligible status in February 2026; the FDA's advisory committee meets in July 2026 for further guidance.
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503A Pharmacy
A US compounding pharmacy that prepares medications for individual patients based on a specific prescription.
Pharmacy & RegulationCompounded Peptide
A peptide prepared for an individual patient by a licensed compounding pharmacy, prescribed by a clinician and tested for identity, potency and contamination.
Pharmacy & RegulationBulks List
The FDA's list of substances permitted for compounding under Section 503A — the list that determines which peptides are legally compoundable.
$149 panel.
A clinician reads it in 24 hours.
Order the Peptide Readiness Panel, draw at a Quest or LabCorp near you, and your clinician sends back a matched protocol with a confidence score.