BPC-157 COA Guide: What to Check Before You Buy
BPC-157 is one of the most-purchased research peptides — which also makes it one of the most-faked. Before buying from any vendor, the single most useful document is the lot-specific Certificate of Analysis. Here is exactly what a legitimate BPC-157 COA should show.
The four checks
1. Identity by mass spectrometry. BPC-157 (pentadecapeptide, sequence GEPPPGKPADDAGLV) has a monoisotopic mass around 1418.7 Da and an average mass around 1419.5 Da. The COA's observed mass should sit within instrument tolerance of the theoretical value. No mass-spec section at all is a red flag — purity without identity proves nothing.
2. Purity by HPLC — with the chromatogram. Look for a stated main-peak area percentage (reputable research material is typically ≥98–99%) read from an attached chromatogram, not just a typed number. Identical-looking chromatograms across a vendor's entire catalog are the classic sign of a recycled certificate.
3. A lot number that matches your vial. The COA is only evidence if it ties to the exact batch you receive. No lot number, or a lot number that doesn't match the label, means the document is marketing, not testing.
4. A named, contactable third-party lab. "In-house testing" isn't independent. A real cert names the laboratory and is dated within a reasonable window of the batch's production.
Run any COA through our free COA checker for a guided version of these checks, and see how to read a COA for the fundamentals.
Handling notes (research context)
Lyophilized BPC-157 stores best cool, dry, and dark; for long-term storage, −20°C. Once reconstituted for laboratory use, refrigerate at 2–8°C and use within the appropriate timeframe — the reconstitution calculator handles the concentration math, and the stability estimator covers storage windows.