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Research-Grade Suppliers

US-based vendors supplying research peptides for laboratory and preclinical use.

Research vs Pharmaceutical Grade

Same chemistry (SPPS), different infrastructure. Research-grade peptides lack the validated processes, full documentation, and regulatory oversight of GMP manufacturing. Appropriate for lab work — not for patients. Full comparison →

US Research Vendors

Limitless Biotech
Florida · Research Grade

Broad catalog, batch-specific COAs, same-day shipping, 30-day guarantee. Extends into nootropics. Currently the most widely recommended research vendor.

Sports Technology Labs
US-Based · Research Grade

Newer but strong reputation. 99%+ purity claims via HPLC. Competitive pricing, fast shipping, growing catalog.

Biotech Peptides
San Diego, CA · Research Grade

87+ product catalog. Third-party tested. Standard payments. Reliable but faces increasing competition.

Note: Peptide Sciences (Henderson, NV) ceased operations March 2026. Independent testing prior to closure reportedly showed purity as low as 75% on some products.

What to Check

Batch-specific COAs (not templates). HPLC chromatograms (not just percentages). Mass spec identity confirmation. Consistent results across orders. Red flags guide →