What to Look for in a Peptide Supplier: Purity Testing, COAs, and Quality Standards
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For Research Use Only. Provided strictly for in-vitro laboratory and educational purposes for qualified researchers. This describes molecular and mechanistic research only, is not medical advice, and refers to no product intended for human or veterinary use, diagnosis, or treatment. Not evaluated by the FDA.
Analytical verification is what separates a research-grade reference material from an uncharacterized sample. This guide summarizes the core methods used to establish peptide purity and identity.
HPLC — purity
Reverse-phase high-performance liquid chromatography separates a sample by hydrophobicity; the area of the main peak relative to impurities gives a percent-purity figure, with a chromatogram as evidence. A research-grade threshold is commonly ≥98%.
Free Tool
Peptide Reconstitution Calculator
Convert vial strength, water volume, and reference quantity into precise syringe units. Works for BPC-157, TB-500, GHK-Cu, and all research peptides.
Try the Calculator →Mass spectrometry — identity
Mass spectrometry measures molecular mass, confirming the compound is the intended molecule by matching observed to theoretical mass. HPLC shows how pure a sample is; MS shows what it is.
Certificate of Analysis
A batch-specific COA ties HPLC and MS data to the exact lot, and should name an independent testing laboratory.
Research Use Only — not for human or veterinary use, diagnosis, or treatment. Purchases are restricted to qualified researchers.