# Peptide COAs: purity, testing and evidence

Source: https://www.sanarahealth.co.uk/peptides/peptide-quality-coa/

Updated: 2026-09-08. AI-assisted editorial information; not clinically reviewed.

A certificate of analysis (COA) describes tests performed on a sample. To judge its relevance, match the product and batch, identify the laboratory, check the methods and see what was actually measured. A purity percentage alone is not evidence of clinical safety, sterility or a product licence.

## Start with the sample and batch

Check whether the report refers to raw material, a finished product or a sample supplied by the seller. Those are not automatically equivalent. A report may be authentic but still fail to describe the item currently offered.

Record the batch or lot identifier, sample description, report number, test date and supplier. Look for a way to verify the report directly with the named laboratory. A screenshot with a removed header or an undated badge provides less traceability than a complete report.

## Different tests answer different questions

The following distinctions help you ask informed questions. They are not a protocol for carrying out laboratory tests or deciding whether a product is safe to use.

Result | Question it addresses | What it does not establish alone

Identity | Is the measured material consistent with the stated compound? | Suitability for a patient or cosmetic use

Chromatographic purity | How the detected components compare under a specific method | That the entire contents are the stated active material

Quantity / assay | How much specified material was measured | The correct amount for any individual

Microbiological testing | Which organisms or microbial properties were assessed | All other chemical and clinical risks

Batch and stability records | Which lot and storage conditions the evidence covers | A licence or an effectiveness claim

Source: MHRA: how products are classified as medicines — https://www.gov.uk/guidance/borderline-products-how-to-tell-if-your-product-is-a-medicine

## Why “99% pure” is not a complete quality statement

A reported percentage has to be read with its method, detection limits and sample preparation. It does not tell you everything that was absent, and it should not be converted into a “99% safe” claim. Two reports using different methods may not support a meaningful ranking.

A vendor-wide average can also hide variation between products and batches. For a useful comparison, retain the individual results and the dates instead of replacing them with a single unexplained score.

## A practical evidence record

Use a small evidence table for each product you are investigating. “Not provided” is a valid entry; it makes an uncertainty visible rather than turning it into an assumed pass.

- Full product name, formula or specification, and intended use.

- Batch identifier on the product and on the report.

- Who selected the sample and who commissioned the test.

- Laboratory name and an independent contact or report-verification route.

- Methods, results, units and any stated limits or qualifications.

- Which safety questions were not tested.

- Date checked and any unanswered questions sent to the supplier.

## Keep analytical quality separate from healthcare decisions

A sound analytical report can make a supplier’s documentation easier to audit. It cannot decide whether a person needs treatment or whether a particular use is appropriate. For a medicine, clinical evidence and the regulated supply pathway remain separate requirements.

For a finished face serum, also check the full ingredient label and directions. For a food supplement, inspect allergens and serving information. If a seller supplies only a raw-material report, ask for the information relevant to the finished product instead of assuming it is covered.

Source: GOV.UK: consumer products and cosmetics — https://www.gov.uk/guidance/consumer-products-cosmetics

Source: GPhC: staying safe when getting treatment online — https://assets.pharmacyregulation.org/files/2024-11/how-to-keep-safe-when-getting-medicines-or-treatment-online.pdf

## Questions

### Is a COA the same as independent product certification?

No. A COA records sample test results. Independence, sample selection, batch relevance and the scope of testing must be checked separately.

### Can a COA prove halal status?

A chemical COA does not establish ingredient provenance, processing controls or halal certification. Those need separate documentation.

### Is a missing test the same as a failed test?

No. Missing evidence and a test failure are different findings. Neither should be silently converted into a verified pass.

## Sources

MHRA: how products are classified as medicines: https://www.gov.uk/guidance/borderline-products-how-to-tell-if-your-product-is-a-medicine

GOV.UK: consumer products and cosmetics: https://www.gov.uk/guidance/consumer-products-cosmetics

GPhC: staying safe when getting treatment online: https://assets.pharmacyregulation.org/files/2024-11/how-to-keep-safe-when-getting-medicines-or-treatment-online.pdf