How To Read A Certificate Of Analysis

A Certificate of Analysis (COA) is one of the most important documents you’ll see when buying research peptides. It confirms that the product you’ve received has been tested for quality, purity, and identity, giving you confidence in your research. Every batch of peptides at Bluewell is backed by a COA so you can be sure of exactly what you’re working with.

Why COAs Matter

COAs are essential for transparency and reliability in the peptide space. They show you exactly what’s inside your vial, how pure it is, and how it should be stored. When comparing suppliers, always check that a COA is available — it’s one of the simplest ways to verify trust and quality.

👉 You can view all of our COAs here: Bluewell Peptides COA Library

Key Sections of a COA

1. Batch Number & Date

This identifies the specific batch your vial came from. It ensures traceability and lets you cross-check that your peptide matches the documentation.

2. Product & Identifiers

The COA will show the peptide name, CAS number, and PubChem CID. These identifiers confirm the compound’s scientific accuracy.

3. Molecular Formula & Weight

Here you’ll find the chemical structure and molecular weight. Researchers use this data to confirm the compound aligns with expected values.

4. Storage Guidelines

The COA lists how long peptides remain stable at different conditions:

Room temperature
Refrigerated (2–8 °C)
Frozen (-20 °C or below)
After reconstitution

Following these recommendations helps you preserve the integrity of your peptide for reliable results.

5. Test Results

This is the most critical section:

Appearance: The physical look of the powder.
Purity (HPLC): High-performance liquid chromatography measures purity — usually 99%+ for quality peptides.
TFA Content: Shows the level of trifluoroacetic acid remaining.
Identification (NMR/MS): Confirms the peptide’s molecular “fingerprint.”

6. Purity Level

Often displayed clearly on the COA (e.g., 99.1% HPLC). The higher the percentage, the better for research reliability.

7. Research Disclaimer

You’ll always see: “For research use only. Not for human consumption.” This keeps things compliant and clear.

How to Use a COA When Ordering

Match the batch number on your vial with the COA.
Check the purity percentage — quality peptides should exceed 99% HPLC.
Confirm the storage guidelines and follow them for maximum stability.

👉 Browse all of our research peptides with full COA support.

If you’re looking for specific products, here are some of our most popular peptides:

Final Thoughts

A COA is more than just a piece of paper. It’s proof that your peptide has been tested and verified. By understanding how to read a COA, you can buy with confidence and ensure your research is built on a foundation of quality and accuracy.