Question 1

What is a certificate of analysis (CoA)?

Accepted Answer

A document issued by an analytical laboratory stating the results of tests on a specific batch of a substance — typically identity (HPLC, mass spectrometry), purity, and sometimes endotoxin or microbial testing. Common in research-chemical supply, much less common in regulated pharmaceutical supply (where the regulatory framework handles batch release).

Question 2

Does a CoA prove a product is safe?

Accepted Answer

No. A CoA confirms what the lab measured at the time on a sample provided. It does not test for unmeasured impurities, manufacturing-process consistency, sterility for injectable use, long-term clinical safety, or whether the sample is representative of what arrived in your vial.

Question 3

Does a CoA prove a product is genuine?

Accepted Answer

Only for the specific sample the lab tested. The product you receive may be from a different batch, may have been substituted, or may have degraded in transit. CoAs are common ground-truth claims by sellers but do not chain-of-custody to your specific vial.

Question 4

Is a third-party CoA more reliable than the seller's own?

Accepted Answer

Yes, in principle — independent labs have no commercial interest in the result. But many 'third-party' CoAs published by retailers are not verifiable as independent. Reputable labs include contact details that allow direct verification.

Question 5

What testing methods should a CoA show?

Accepted Answer

For identity: HPLC (purity), mass spectrometry (identity confirmation). For injectable use: endotoxin testing, microbial / sterility testing, residual solvents. For peptide products specifically: amino-acid sequence confirmation by MS/MS.

Question 6

Is a CoA a substitute for MHRA approval?

Accepted Answer

No. MHRA approval evaluates the entire manufacturing process, clinical evidence, safety profile, batch-release controls, and ongoing pharmacovigilance. A CoA tests one sample at one time. The two are not comparable.

Question 7

If a research peptide has a 'good CoA' is it safe for human use?

Accepted Answer

No. CoAs do not address clinical safety. The compound may be 99%+ pure and still cause harm in humans if it has no clinical safety profile. Many research peptides have no human safety data regardless of CoA quality.

Question 8

Are some peptide CoAs fake?

Accepted Answer

Yes — fake or doctored CoAs have been reported. Independent verification with the named lab is the only way to confirm authenticity. Many retailers publish CoAs without lab contact details.

Question 9

Do compounding pharmacies issue CoAs?

Accepted Answer

Some do for compounded preparations. UK regulated compounding (specials) operates under broader quality-control requirements; a CoA alone is not the relevant standard. 'Compounded GLP-1' marketed by online clinics may include a CoA but engages broader MHRA enforcement concerns.

Question 10

Should I rely on a CoA when buying online?

Accepted Answer

A CoA is one data point, not a safety signal. The broader question is: is this supply route lawful, is the product licensed for human use, is there a UK-regulated supply chain? A CoA does not change the answer to any of those questions.

Certificates of analysis — frequently asked questions

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Certificates of analysis — frequently asked questions

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