A Certificate of Analysis — or COA — is the single most important document when sourcing research peptides. This article explains what a COA is, what it should contain, and why you should never buy research peptides without one.
What a COA Is
A Certificate of Analysis is a lab document that reports the test results for a specific batch of a compound. Think of it as the peptide's report card: it proves what the product actually contains and how pure it is, based on independent testing.
What a Good COA Contains
A proper research peptide COA should include:
- Batch/lot number — so the COA matches the exact batch you received.
- Testing date — showing when the analysis was performed.
- HPLC results — confirming purity (look for 99%+).
- Mass spectrometry results — confirming the compound's identity by molecular weight.
- The testing lab — ideally an independent, third-party laboratory.
"Batch Tested" vs "Sampled"
There's an important distinction: a supplier that tests every batch is more reliable than one that tests a single sample and applies it to everything. Batch-by-batch testing means the specific vials you receive are backed by their own results — not an old or unrelated test.
Why a COA Is Non-Negotiable
Without a COA, you're trusting a label with no proof behind it. In research, that's unacceptable — an unverified compound can quietly ruin a study. A batch-specific COA is what separates a serious research supplier from a risky one. If a seller can't provide one, that's a red flag.
How to Get a COA
Reputable suppliers make COAs available for each batch. At Helio Peptides, a Certificate of Analysis is available for every order — you can request the COA for your specific batch by contacting support with your order details.
Key Takeaways
- A COA is a batch-specific lab document proving a peptide's purity and identity.
- A good COA includes batch number, testing date, HPLC (99%+) and mass-spec results, and the testing lab.
- Batch-by-batch testing beats one-time sampling.
- Never buy research peptides without a COA — and all such products are for laboratory research use only.
Every Helio Peptides batch is third-party tested to 99%+ purity, with a Certificate of Analysis available for your order. Browse our research peptides →
Disclaimer: All products are intended solely for laboratory research and are not for human or animal consumption. These statements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease.