Peptide Therapy in California

Browse 35 verified peptide businesses in California — clinics, compounding pharmacies, research labs, and trusted suppliers. All listings are reviewed by the The Peptide Alliance editorial team.

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Top cities in California

PolyPeptide Group

Global GMP peptide CDMO with North American headquarters in Torrance, CA. One of the world's largest dedicated peptide manufacturers. Specializes in peptide API manufacturing from Phase I through commercial scale.

Torrance, CA (US)National
Manufacturers

Bachem Americas

Bachem is a global leader in peptide and oligonucleotide manufacturing with US operations in Torrance, CA. Offers full GMP manufacturing services for peptide APIs and finished dosage forms. Serves biopharma companies developing peptide-based therapeutics worldwide.

Torrance, CA (US)
Manufacturers

Bachem Americas

US subsidiary of Swiss-based Bachem Holding, a global leader in peptide chemistry. FDA-registered and GMP-compliant. Provides full-service CDMO capabilities from process development to large-scale commercial API production.

Torrance, CA (US)National
Manufacturers

Phoenix Pharmaceuticals

California-based peptide synthesis and manufacturing company offering custom peptide synthesis, GLP and GMP manufacturing, and research-grade peptides. Serves academic institutions, biotech companies, and pharmaceutical developers with high-quality custom peptide APIs.

Burlingame, CA (US)
Manufacturers

AnaSpec

Leading biotech CMO with 30+ years of peptide manufacturing experience. 44,000 sq ft facility in California's Silicon Valley. Manufactures custom GMP peptides and dyes for diagnostics, biopharmaceuticals, and cosmetics.

Fremont, CA (US)National
Manufacturers

ImprimisRx

San Diego-based 503B outsourcing facility offering compounded ophthalmology, urology, and specialty medications including peptide-based preparations. FDA-registered, PCAB-accredited, and ships nationally to healthcare providers.

San Diego, CA (US)National
Manufacturers

CPC Scientific

CDMO specializing in large-scale, late-phase, and commercial GMP peptide and oligonucleotide manufacturing. Annual peptide API production capacity exceeds 1,000 kg. Serves clinical and commercial pharmaceutical clients.

Rocklin, CA (US)National
Manufacturers

Enovachem Pharmaceuticals

Torrance-based 503B pharmaceutical outsourcing facility manufacturing sterile injectable peptide preparations including sermorelin, ipamorelin, and CJC-1295. FDA-registered and ships to licensed practitioners nationally.

Torrance, CA (US)National
Manufacturers

Abzena

Integrated biologics and peptide CDMO with San Diego bioconjugation facilities. Offers end-to-end pharmaceutical development and manufacturing services including custom peptide-drug conjugate production for biopharma.

San Diego, CA (US)National
Manufacturers