Certified-PEP, a U.S.-based supplier of peptides and compounds for laboratory research, has published its 2026 Research Peptide Supplier Comparison, evaluating 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, aims to provide qualified research customers with a structured framework for evaluating suppliers of laboratory research materials.
The study examined publicly available supplier information and purchasing processes using a 100-point scoring system to assess documentation, transparency, and other factors relevant to research customers. Certified-PEP conducted and published the comparison and was itself one of the suppliers evaluated. The company has made its scoring methodology and individual supplier results available in the full report.
The 10 suppliers evaluated, 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. They were assessed on testing and COA transparency, manufacturing disclosures, customer reviews, pricing, checkout functionality, shipping information, and payment options. The complete rankings, individual scores, and methodology are detailed in the published comparison.
The study identified differences among suppliers in the availability of manufacturing information, independent testing documentation, public customer reviews, and purchasing options. A key area of interest was the availability of Certificates of Analysis and the extent to which suppliers make analytical testing information accessible. The comparison also examined whether suppliers identify the laboratories performing analytical testing, provide documentation associated with specific product batches, and make manufacturing-origin information available. Customer reviews, shipping policies, payment options, and online purchasing functionality were also included.
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 offers a way to review analytical information associated with the materials they receive.
The Certified-PEP comparison 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 results can be independently reviewed. The report 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. All Certified-PEP product batches are tested by Vanguard Laboratory, with Certificates of Analysis 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 Certified-PEP’s emphasis on providing research customers with information about the materials they purchase, including manufacturing origin, analytical testing, and product traceability.
The 2026 comparison is intended to provide a structured framework for reviewing information that research compound suppliers make available. Because Certified-PEP conducted the study and participated in the evaluation, its findings represent a company-published comparison rather than independent third-party research. The published methodology and supporting information allow readers to examine the criteria and assess the findings for themselves. 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 complete 2026 Research Peptide Supplier Comparison is available on the Certified-PEP website.
