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How to read a peptide certificate of analysis (COA)

A certificate of analysis, or COA, is a lab’s report on a sample a brand sent for testing. Most UK and EU research peptide brands publish them, and they are the main document buyers use to compare brands. This guide explains what is on a peptide COA, how to check one, and what it can and cannot tell you.

What a peptide COA shows

  • The lab. The name of the testing laboratory, for example Janoshik Analytical in Prague, which many European brands use.
  • The sample. The compound and strength the brand declared, such as “BPC-157 10 mg”, and often a batch or lot number.
  • Identity. Mass spectrometry (MS) confirms the molecule in the vial matches the expected molecular weight.
  • Purity. High-performance liquid chromatography (HPLC) gives the share of the main peak, written as a percentage.
  • Quantity. Some reports measure the actual milligrams in the vial, which can differ from the label.
  • Dates. When the sample was received and when it was tested.

How to check a COA

  1. Match the compound, strength and batch number on the COA to the product you are buying. A report for a 5 mg vial says nothing about a 10 mg one.
  2. Look the report up at the lab where possible. Janoshik, for example, publishes a verification code that opens the original result on its own site.
  3. Check the test date. A report from two years ago covers a batch that is probably sold out.
  4. Read the quantity line as well as purity. A high purity figure with a low measured amount means less compound than the label.

What a COA cannot tell you

A certificate describes one sample on one date. It does not prove that every vial from the same brand matches it, it is not an approval by any regulator, and it says nothing about whether a product is suitable for any use other than laboratory research. Some independent reviewers have also found certificates they could not match to the named lab, which is why looking a report up at the source matters.

COAs on this marketplace

When a brand supplies a certificate that matches a listing, it appears on the product page and in the lab report library, marked as covering the exact item, another strength, or one ingredient of a blend. Brand pages summarise what each brand publishes about testing.