Question 1

What does the purity reading mean on this GHK-Cu Serum COA?

Accepted Answer

No purity reading is on file for this COA. Some certificates record identity confirmation (correct compound, correct molecular weight) without a numeric purity percentage — check the individual test fields for details.

Question 2

How do I verify this GHK-Cu Serum 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 Reta One Labs a legitimate peptide vendor?

Accepted Answer

Merit Verified has a vendor profile for Reta One Labs 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.