The Peptide Transparency Database
What the studies on peptides actually show
Plain-language summaries of the scientific studies on peptides: what was tested, what it found, what it cannot show, and who paid for it.
Start with a topic
Peptides for skin & anti-aging
Two kinds of peptide are marketed for skin: collagen peptides you swallow, and peptides such as GHK-Cu you apply to the skin. The evidence is very different for each.
Peptides for muscle & strength
Muscle claims cover a wide range, from collagen powder to injectable growth-hormone-releasing compounds. The studies in this hub only support a narrow claim for one of them.
Peptides for joints & tendons
Joint and tendon claims range from collagen supplements for osteoarthritis to injected BPC-157 for injuries. The human evidence is stronger for the first than the second, but neither is clear-cut.
Peptide safety & regulation
Peptides range from approved prescription drugs to unapproved compounds sold with little oversight. Safety evidence follows the same split.
How to read a peptide study
Not all studies are equal. A trial that compares people who took a peptide with people who did not tells you far more than a report with no comparison group, and a result in animals often does not carry over to people. Every summary here says what was tested, what was found, what the study cannot show, and who paid for it. Read the methodology.