Educational resource for peptides

Quality / COA / Testing

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Get Clarity

How to Read a COA

A Certificate of Analysis, or COA, is a document that provides testing information for a specific lot or batch. COAs may
include identity, purity, and other quality-related data depending on the testing performed.

What is a COA?

Understand the basics in this documentation.

Why third-party testing matters.

Learn how to assess purity and choose trusted sources.

What purity means.

Higher purity helps ensure greater consistency and reliability.

What red flags to look for.

Let's make it easy for you to verify your product.

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Certificate of Analysis

A Certificate of Analysis is a document that provides testing information for a specific lot or batch.

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Why third-party testing matters.

Third-party testing means that an independent laboratory, not the manufacturer, verifies the identity, purity, and quality of a product. This additional layer of verification helps ensure that every batch meets established specifications before it reaches researchers.

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Purity

Purity refers to the percentage of a sample that is the intended peptide, rather than impurities such as incomplete peptide fragments, byproducts from synthesis, or degradation products.

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Catch red flags.

A reputable supplier should provide clear documentation, maintain consistent quality standards, and make batch-specific testing results readily available. Transparency is one of the strongest indicators of a commitment to quality.

• No COA

• COA does not match the lot number

• No batch number

• No company transparency

• Unrealistic claims

• Damaged packaging

• No storage guidance

• Product looks cloudy or discolored after reconstitution

• Visible floating particles

• Unknown source or manufacturer