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Peptide API Manufacturers

Who makes peptide APIs, what GMP means, and the major US-based players.

How Peptides Are Made

Most peptide APIs are manufactured via solid-phase peptide synthesis (SPPS): amino acids coupled sequentially to a resin, cleaved, purified by HPLC, and lyophilized. GMP adds validated processes, environmental monitoring, equipment calibration, full batch documentation, and regulatory inspections to this chemistry. GMP explained →

US-Based Manufacturers

AmbioPharm
North Augusta, SC

One of the largest US peptide manufacturers. FDA-inspected, cGMP. 500+ staff. Clinical through commercial scale.

Bachem
Torrance, CA · HQ: Switzerland

Global leader. Decades of experience across research through commercial GMP. Serves major pharma companies.

CPC Scientific
Sunnyvale, CA

CDMO with 25+ years. 300+ CMC projects. Discovery through commercial GMP production.

Evaluating a Manufacturer

Current GMP certificate with issuing authority. FDA inspection history. Drug Master File status. Batch-specific COAs. Stability data. US customer references. Full evaluation guide →