Find clear answers about peptides.
Search a peptide or question. Read what the evidence supports, where it stops, and what remains unknown.
New to peptides? Start with the basics34 peptide reviews · 137 fact checks · Last checked September 12, 2026
Explore a question.
Browse peptides.
Tirzepatide is the active ingredient in Mounjaro and Zepbound. Each approved product has its own uses and safety information. An approval for one product does not automatically apply to the other.
Health results for approved usesSemaglutideThis review covers Ozempic, Rybelsus, Wegovy, and the Wegovy HD strength. Their forms, approved uses, and labels differ.
Body changes, not proven benefitsSermorelinStudies in people show a growth-hormone response. They do not prove broad anti-aging or muscle-building benefits. Former Geref products are no longer sold.
Health results for approved usesInsulinInsulin is a family of diabetes medicines. Different products can have different timing, risks, and instructions.
Health results for approved usesLiraglutideAn established prescription medicine. Its evidence applies to specific products, uses, groups of people, and current labels.
Body changes, not proven benefitsCJC-1295Short studies in healthy adults found that CJC-1295 raised growth hormone (GH) and insulin-like growth factor 1 (IGF-1). These hormone measurements do not prove better recovery, muscle gain, or fat loss.
About these labels
Health results for approved uses: Approved products have evidence from studies in people that measured health results for specific uses. This does not show that every product, person, or use has the same result.
Body changes, not proven benefits: Studies in people measured how the substance changed the body. This did not establish a health benefit on its own.
Peptide fact checks.
How fact checks work.
Each fact check covers one statement and one situation. A molecule, an approved product, and an online product may not have the same evidence.
- The statement
“RETA’s results mean it is basically approved.”
- What the sources showSeveral late-stage trial resultsEarly results reported by the sponsorFoundAn FDA-approved productNone for retatrutide yetNot yet
- The answerThe sponsor reported large average weight reductions in late-stage trials.
Retatrutide is still being studied. It is not approved.
The trial shows what happened in that study. It does not by itself prove approval or that products sold online match the product studied.
Read the retatrutide review