The evidence library

Peptide research & evidence

Look beyond the headline claim. Explore our coverage of peptide studies, what those studies measured and the questions they leave open.

Explore the evidence guides

Copper Peptides in Skincare: GHK-Cu Labels Explained
Skincare ingredient guide · Sources checked October 5, 2026 Copper-peptide skincare labels can leave several questions unanswered: which ingredient is present, what a percentage describes, and whether the research actually tested the finished serum. GHK-Cu is one copper-peptide complex discussed in skin research. A mention of that ingredient is a starting point for reading the evidence, not proof of a particular result. This guide focuses on topical cosmetic labels and product claims. It provides no instructions for preparing or injecting peptides. Start with the full ingredient list Read the ingredient... Read more...
Peptide Research Glossary: 12 Terms Explained
A plain-language reference for reading peptide research: study design, comparison groups, sample size, significance and the limits of a single study. Read more...
Sermorelin Explained: Uses, Evidence, Risks and Costs
Understand what sermorelin research shows, how the historical Geref record differs from compounded products, and which questions to ask before comparing provider plans. Read more...
How to Read Peptide Research and Clinical Evidence
Learn how to read peptide research: distinguish study types, check whether results support a claim, understand trial records, and practice with a fictional example. Read more...
GHK-Cu Copper Peptide: Evidence for Skin & Hair
A guide to the studies discussed in our GHK-Cu coverage, with separate sections on topical skin research, hair-related claims, study limitations and FDA documents. Read more...
Tesamorelin vs Sermorelin: Key Differences (2026)
Compare the topics behind tesamorelin and sermorelin coverage: regulatory history, study populations, evidence limits and how telehealth listings differ. Read more...
Tesamorelin: FDA Record, Trials & Compounded Cost
Explore tesamorelin’s regulatory history, the trials discussed in our review, reported adverse events and the distinction between branded and compounded products. Read more...
Does BPC-157 Work? The Evidence, Side Effects and Safety Data
A closer look at the human and animal studies discussed in BPC-157 coverage, including study design, unanswered safety questions and the regulatory record. Read more...