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US-Based GMP Peptide API Manufacturers
Peptide API manufacturers operating GMP facilities in the United States. This list is framed by facility location, not company ownership — foreign-parented operators like Bachem and PolyPeptide are included because they run US GMP sites.
Manufacturers
checked Jul 21, 2026| Manufacturer | US facilities | Grade | Source |
|---|---|---|---|
| CordenPharmaForeign-parented, US-based facility | Boulder, CO | GMP | View source → |
| AmbioPharmForeign-parented, US-based facility | North Augusta, SC | GMP | View source → |
| Cambrex (Snapdragon Chemistry) | Waltham, MA | GMP | View source → |
| BachemForeign-parented, US-based facility | Torrance, CA · Vista, CA | GMP | View source → |
| PolyPeptideForeign-parented, US-based facility | Torrance, CA · San Diego, CA | GMP | View source → |
Facility and GMP-status data as of the dates shown. Verify current status directly with each manufacturer or the FDA before making sourcing decisions.
What this means
GMP (Good Manufacturing Practice) means a facility follows FDA-recognized quality and process controls for pharmaceutical-grade production. RUO (Research Use Only) material is not manufactured under those controls and is not intended for human use.
A US-based facility is not the same as a US-owned company. Several manufacturers on this list operate GMP facilities on US soil while being owned by a foreign parent company — that distinction is shown separately for each entry and is never used to exclude a manufacturer from this list.
This page is educational and informational only. Not medical advice. It does not recommend, endorse, or evaluate any product for human use, and does not provide dosing, protocol, or treatment guidance.