Peptide Testing & Documentation Guide

Laboratory reports can provide useful information about a sample, but understanding what they establish—and what they do not establish—is essential.

Amino Review explains common analytical methods and documentation practices to help readers evaluate the evidence vendors make available.

Understanding a Certificate of Analysis

A certificate of analysis (COA) is a document reporting analytical results for a specified sample. Its usefulness depends on the information provided, the methods used, and whether the report can be authenticated.

When reviewing a COA, consider:

• Sample identity: Is the sample clearly identified?
• Testing date: When was the sample analyzed?
• Laboratory identity: Is the laboratory named and independently verifiable?
• Analytical methods: Does the report identify the methods used?
• Results and units: Are the findings presented clearly, with appropriate units and limits?
• Traceability: Is there enough information to connect the report to the sample or batch being discussed?

Common Analytical Methods

High-Performance Liquid Chromatography (HPLC)

HPLC separates components in a sample. Depending on the method and reference materials used, it can help assess a sample’s composition or estimate purity. A chromatogram alone does not establish the identity of every component.

Mass Spectrometry (MS)

Mass spectrometry measures characteristics related to the mass-to-charge ratio of ions. It can provide evidence useful for identifying compounds, but interpretation depends on the instrument, method, sample, and supporting data.

Why Multiple Methods May Matter

Different methods answer different questions. Results from complementary methods can provide stronger evidence than a single measurement, but the conclusions must remain within the limits of the methods and the sample tested.

Important Limitations

A laboratory report applies to the sample actually analyzed. It does not automatically establish that every unit in a batch—or every future batch—has the same characteristics.

A reported purity value also does not necessarily establish identity, sterility, absence of contaminants, stability, or safety for human use.

Vendor-provided reports should be distinguished from reports independently obtained and authenticated by a reviewer.

Our Approach

Amino Review aims to identify the source of testing information, explain what the reported methods can establish, and disclose missing information or uncertainty. We do not claim to have independently tested a sample unless we have evidence that the testing was performed.

Educational disclaimer: This guide provides general information about analytical documentation. It is not medical advice, and it does not establish that any research-use-only substance is approved or safe for human use.