Certified-PEP, a U.S.-based supplier of peptides and compounds for laboratory research, has released its 2026 Research Peptide Supplier Comparison, a study that evaluates 10 suppliers on criteria including independent laboratory testing, Certificates of Analysis (COAs), manufacturing disclosures, customer reviews, and purchasing information. The comparison, conducted in October 2026, is intended to give qualified research customers a structured framework for assessing suppliers of laboratory research materials. The company has made its scoring methodology and individual supplier results available in the full report.
The 10 suppliers examined, listed alphabetically, are American Peptides, BioLongevity Labs, Certified-PEP, Glacier Aminos, Hydro Research, Instant Peptides, Ion Peptide, Mile High Compounds, Modern Peptides, and Phoenix Pharmaceuticals. Each was assessed using a 100-point scoring system covering testing and COA transparency, manufacturing disclosures, customer reviews, pricing, checkout functionality, shipping information, and payment options. Notably, Certified-PEP conducted the comparison and was itself one of the suppliers evaluated, meaning the findings represent a company-published analysis rather than independent third-party research. The published methodology allows readers to examine the criteria and assess the findings for themselves.
The study identified differences among suppliers in the availability of manufacturing information, independent testing documentation, public customer reviews, and purchasing options. One area of particular interest was the availability of COAs and the extent to which suppliers make analytical testing information accessible to research customers. The comparison also examined whether suppliers identify the laboratories performing their analytical testing, provide documentation associated with specific product batches, and make manufacturing-origin information available. Customer reviews, shipping policies, payment options, and the functionality of online purchasing systems were also included in the evaluation. The findings highlight the range of information available to research customers and the importance of reviewing supplier documentation rather than relying solely on product descriptions or general quality claims.
A Certificate of Analysis provides information about analytical testing performed on a particular material or batch, potentially including product identity, purity, analytical methods, and other quality-related characteristics. For qualified research customers, batch-specific documentation can offer a way to review analytical information associated with the materials they receive rather than relying solely on general product descriptions or stated purity levels. The report encourages research customers to consider several questions when evaluating suppliers, including whether the testing laboratory is identified, whether documentation corresponds to a specific batch, what analytical methods were used, and whether the results can be independently reviewed. It also discusses the distinction between a stated purity percentage and more comprehensive analytical documentation, noting that purity testing alone does not necessarily establish a compound's identity or address every characteristic relevant to laboratory research. A COA documents the results of specified analytical tests and does not, by itself, establish that a research compound is safe or effective for human use.
Certified-PEP emphasizes U.S. manufacturing, independent batch testing, and accessible analytical documentation as part of its approach. All Certified-PEP product batches are tested by Vanguard Laboratory, with COAs made available for corresponding products. The company also includes QR codes on every vial, allowing research customers to access available batch-specific documentation through Vanguard Laboratory's reporting system. These practices reflect the company's emphasis on providing research customers with information about the materials they purchase, including manufacturing origin, analytical testing, and product traceability. The full report includes a side-by-side comparison of the 10 suppliers, individual scoring results, analytical documentation examples, and a checklist of questions for evaluating research compound suppliers. The comparison is available on the Certified-PEP website.
