PureBio Labs

Executive Summary

Certificate of Analysis (COA) Practices

Status: COA ✓ (third-party lab tested)

COA URL: https://purebiolabs.com/pages/coa-reports

Notes: Public COA library at /pages/coa-reports with no login: 174 report images across 78 pages, covering about 73 of 83 individually testable SKUs (~88%). Two named third-party labs. Chromate (chromate.org) issued the older September 2025 reports covering identity, quantity and purity. Ethos Analytics Laboratory (Phoenix, AZ) issues the current June 2026 reports, and those run a FULL panel: chromatographic purity above 99%, bacterial endotoxin below 1.25 EU/ml against a <5 spec, heavy metals by USP <233> with arsenic, cadmium, lead and mercury all below limit of quantitation, and microbiological testing by USP <61>/<62> with E. coli, Salmonella and S. aureus negative. That breadth is wider than most vendors publish. PeptidePrices verified three Chromate reports through the lab's own public portal — GLP-2 10mg (job 28149, code PUREBION54PV, batch 213412-GL, 99.336%), GLP-1 10mg (28147, PUREBIO5L44D, 234645-SE, 99.349%) and GLP-3 10mg (28146, PUREBIOGF4ZK, 453744-GL, 99.328%) — and a deliberately wrong code fails, so a pass is meaningful. The lab's own stored copies were compared against the copies PureBio publishes and are identical. Three Ethos reports were also inspected: GLP-2 10mg (26EA0610-077, lot G2-5159-PB), BPC-157 5mg (26EA0611-108, BP-5143-PB) and CAG+GLP-1 (26EA0611-106, CG-5147-PB), all passing every panel. GLP codenames are confirmed from COA chemistry: GLP-1 = CAS 910463-68-2 = Semaglutide, GLP-2 = CAS 2023788-19-2 / C225H348N48O68 / MW 4813.53 = Tirzepatide, GLP-3 = CAS 2381089-83-2 = Retatrutide. ⚠️ The vial photographed on the GLP-2 COA carries a printed label reading CAS 223460-79-5, MW 3766.1 — the identifiers of endogenous human GLP-2 (1-33), a different molecule from the tirzepatide the report analyses. The GLP-1 and GLP-3 vial labels match their COAs correctly, so this is a GLP-2-specific labelling error. ⚠️ Ethos offers no public verification portal, so the newer full-panel reports cannot be independently checked, and the ISO/IEC 17025 accreditation number 117798 stated on its reports was not found in the A2LA, ANAB or PJLA registries. Only 30 of 101 product pages link their own COA. Content overage on the Chromate lots runs consistently 13-15% above label. PeptidePrices is an affiliate partner (15% commission, 15% customer discount applied by our link) — disclosed per FTC; affiliate status does not influence the rating.

Rating Methodology

PeptidePrices rates vendors on a 1–10 scale using a transparent, weighted rubric:

• 40% COA practices — named third-party lab, batch-to-vial linkage, public on-site publication, testing breadth (HPLC purity, mass-spec identity, endotoxin, sterility, heavy metals)
• 20% Community reputation — Trustpilot weighted by review volume, Reddit/forum sentiment, documented red flags
• 20% Transparency — physical address, company age, ownership disclosure, contact info, domain age, return policy
• 20% Operations — shipping speed, customer-service responsiveness, payment flexibility, and dispute handling; affiliate-program performance is not scored

PeptidePrices is independent. No vendor has paid to increase their score. Full methodology at peptideprices.net/trust.