Certificate of Analysis (COA) & Peptide Purity Testing
Every compound Royal Peptide Labs supplies is manufactured to a 99%+ target purity standard and sold strictly for laboratory research use only. This page explains what a Certificate of Analysis (COA) is, how research-peptide purity is verified, how to read a COA, and how to request batch-related testing information for your order.
What is a Certificate of Analysis (COA)?
A Certificate of Analysis is a document that reports the analytical testing results for a specific production batch of a compound. For research peptides, a COA typically states the identity of the compound, the measured purity, the analytical methods used, and the batch or lot number the results correspond to. A COA is the primary way a researcher confirms that the material in a vial matches what was ordered before it is used in a controlled study.
How to Request a COA for Your Batch
Where available, Royal Peptide Labs provides batch-related testing information to support transparency and purity verification. To request COA information for a specific order or lot, contact our team with your order number and the product name. See our Quality & Testing and Certifications pages for more on our internal quality standards.
How Research-Peptide Purity Is Verified
Two analytical methods are standard across the research-peptide industry for confirming identity and purity:
- High-Performance Liquid Chromatography (HPLC) — separates the components of a sample so the proportion of the target peptide can be measured against any impurities. Purity is usually reported as a percentage (for example, 99%+). HPLC is the most common measure quoted on a peptide COA.
- Mass Spectrometry (MS) — measures the molecular mass of the compound to confirm its identity, verifying that the peptide’s molecular weight matches the expected sequence.
Together, HPLC answers “how pure is it?” and mass spectrometry answers “is it the right molecule?” A complete COA generally references both.
How to Read a Peptide COA
- Product / compound name — the peptide the results describe.
- Batch or lot number — ties the results to a specific production run. A COA is only meaningful for the batch it references.
- Purity (%) — the HPLC-measured proportion of the target peptide.
- Molecular weight — the mass-spectrometry result confirming identity.
- Test date and method notes — when and how the analysis was performed.
Our Purity Standard
Royal Peptide Labs focuses on sourcing and handling practices designed to meet a consistent 99%+ target purity expectation across every order. We are a Michigan-based company focused on providing high-purity research peptides with reliable fulfillment and transparent, research-use-only positioning. Browse our research collections by category:
- GLP-1 & Metabolic Research Peptides
- Growth Hormone Research Peptides
- Recovery & Tissue Repair Peptides
- Longevity & Cellular Health Peptides
- Cognitive & Nootropic Peptides
- Melanocortin Research Peptides
Scientific References
Analytical methods for peptide identity and purity are well documented in the published literature:
All products sold by Royal Peptide Labs are intended strictly for in-vitro laboratory and research use only — not for human, veterinary, diagnostic, or therapeutic use.