Peptide Research & Guides
Information about analytical testing, documentation, and research compounds, presented with sources and references to support a critical reading of the available evidence.
Compound research
Investigational compound
Retatrutide (LY3437943)
An orientation and evidence map for the retatrutide cluster: what is published, what is in the registry, and what the sponsor has only announced.
Explore research β
Investigational compound
BPC-157
BPC-157 β preclinical evidence and research status. The literature is mainly animal; human evidence remains limited.
Explore research β
Investigational compound
GHK-Cu
GHK-Cu β skin and tissue research, and a clinical-evidence assessment. Biological plausibility and a large preclinical literature exist; rigorous human trials remain few.
Explore research β
Investigational compound
TB-500
TB-500 β identity, thymosin Ξ²4 fragments & direct evidence
Explore research β
Investigational compound
MOTS-c
MOTS-c is a mitochondrial-derived peptide. There is preclinical administration, human measurement of the endogenous peptide, and a recruiting Phase 2a trial. Those three layers are not interchangeable.
Explore research β
Investigational compound
CJC-1295 + Ipamorelin
CJC-1295 + Ipamorelin β component evidence vs blend evidence
Explore research β
Investigational compound
Tesamorelin
Tesamorelin is the active ingredient in licensed U.S. EGRIFTA products. Peptra sells a research-use-only material. Those are not the same product.
Explore research β
Investigational compound
PT-141 (Bremelanotide)
PT-141 (Bremelanotide) β clinical evidence, Vyleesi & male research
Explore research β
Analytical guides
Analytical documentation
How to Read a Peptide Certificate of Analysis (COA)
A COA reports analytical information for a specific sample or lot. This guide explains which fields to read and what the document alone cannot establish.
September 1, 2026
Purity
What Does 99% Peptide Purity Mean?
A 99% purity figure usually describes a fraction measured by a particular method. By itself it is not vial content, sterility, or a clinical claim.
September 1, 2026
Analytical methods
HPLC vs LC-MS in Peptide Analysis
HPLC separates and helps characterize components; LC-MS adds mass information that can support identity. They answer different questions.
September 1, 2026