What Makes a Research Peptide Vendor Trustworthy?

PeptideTally Team

We score 276 vendors on our [comparison table](/vendors) across purity, COA quality, pricing and shipping. But what matters most to you when evaluating a vendor?

Our editorial criteria weight COA transparency the heaviest — a named third-party lab with batch-specific testing is the single strongest signal. Shipping speed and pricing matter, but they're secondary to documentation quality.

What's your evaluation checklist? Discuss vendors by name (links are disabled to keep things spam-free).