Certified-PEP, a U.S.-based supplier of peptides and compounds for laboratory research, has released its 2026 Research Peptide Supplier Comparison, a report 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, aims to give qualified research customers a structured framework for assessing suppliers of laboratory 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, a point the company acknowledges in the report. The full methodology and individual supplier results are 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. The scoring covered testing and COA transparency, manufacturing disclosures, customer reviews, pricing, checkout functionality, shipping information and payment options.
The comparison identified differences among suppliers in the availability of manufacturing information, independent testing documentation, public customer reviews and purchasing options. A particular area of interest was the availability of Certificates of Analysis and the extent to which suppliers make analytical testing information accessible to research customers. The study 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.
For qualified research customers, batch-specific documentation can provide 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 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. 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.
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.
