Question 1

What does 99.40% purity mean on this Tesamorelin COA?

Accepted Answer

99.40% purity means that 99.40% of the tested sample was confirmed to be Tesamorelin by HPLC. The remaining fraction is impurities or unlisted compounds. Purity measures identity and concentration of the tested lot — it does not screen for residual solvents, heavy metals, endotoxins, or microbial contamination. Values at or above 98% are typical for quality research peptides in this market.

Question 2

How do I verify this Tesamorelin COA from Vanguard Laboratory is real?

Accepted Answer

To verify this COA is genuine: (1) confirm the issuing lab — Vanguard Laboratory — is a real, independently operating laboratory by searching it outside the vendor's website; (2) if the COA includes a verification ID or QR code, use the lab's public portal to cross-reference; (3) check that the lot number on the COA matches the lot number on your order. Merit Verified indexes this result from Vanguard Laboratory as a third-party record — the original COA document from the lab is the authoritative source.

Question 3

Is Peptidology a legitimate peptide vendor?

Accepted Answer

Merit Verified has a vendor profile for Peptidology with independent COA evidence on file. A COA on file is not an endorsement — it means this specific lot was independently tested. For a full evidence picture including Merit Score, lab diversity, and purity history, see the vendor profile on Merit Verified.

Tesamorelin

See Tesamorelin pricing across 37 verified vendors

Product pages for this peptide at Peptidology

See more evidence