Start with the identifiers
Find the product, lot, issuing lab, report number, dates, and methods. If the lot on the PDF differs from the vial, stop there.
Read the evidence
Read the report, not the marketing.
A polished PDF can still leave the basic questions unanswered. CoaScore reads any vendor's peptide Certificate of Analysis (COA), explains what each result supports, and scores every report against the same documentation criteria.
Open the toolsResearch Use Only. CoaScore evaluates documentation quality. It does not determine safety, suitability for use in humans, or whether a product should be purchased.
How it works
Separate the claims
MS can support identity. HPLC area-% describes relative detector response. Neither one, alone, tells you the net peptide mass in a vial.
See what is missing
The 0–5 score covers identity, purity, amount accuracy, method detail, and lab transparency. It rewards evidence on the page, not a familiar logo.
Research tools
COA Interpreter
Drop in a COA image or PDF, check the extracted fields, and get a line-by-line documentation review.
Read a COA →Reconstitution calculator
Check research-solution concentration and volume math from your own inputs. The arithmetic stays in your browser.
Check the math →Know what the number means
Semaglutide's published molecular weight is about 4,113 Da, so an MS result near that value can support identity. It cannot establish vial quantity. The reading guide explains that distinction; the verification checklist covers the document itself. We also keep notes on labs commonly named on reports and COA red flags.