What are peptides? Can they help, and what risks do they carry? We explain step by step. Choose one of seven separate learning paths.
Explore its uses, research findings and risks.
Peptides A–Z ↗02Read about the latest findings and see what they concern.
News ↗03Search the catalogue of publications, trial registry entries and articles.
Library ↗04Find an answer and the relevant part of Pepto.
Questions and answers ↗05Check the medicine's name and find out where to ask about availability.
Alternatives ↗Weight loss / Health
Retatrutide is an investigational substance acting on receptors for three hormones involved in appetite and metabolism. Large trials in people with obesity, including those with type 2 diabetes, were published in 2026. The findings are promising, but publication does not mean a new medicine has been approved.
Weight loss / Health
Semaglutide is the active ingredient in Wegovy, Ozempic and Rybelsus. It is a peptide used in legally authorised prescription medicines that help treat type 2 diabetes or manage body weight, depending on the product.
Weight loss / Health
Tirzepatide is an active ingredient in prescription medicines. In the EU, Mounjaro is used for type 2 diabetes and excess-weight treatment in defined patients. In the USA, Zepbound is used for purposes including obesity treatment. Benefits and limitations come from studies of specific medicines.
Mounjaro, which contains the active ingredient tirzepatide, is injected under the skin — including into the abdomen when there is a noticeable layer of fat. We explain what is known about injection sites and why the medicine must not be injected into a muscle.
The aim of treatment is not to stop eating. The return of appetite is not a reason to take extra injections. We explain what is known about how Semaglutide works and why more medicine does not mean better treatment.
A new analysis from September 2026 concerns body composition and physical function during obesity treatment. Its small size calls for careful interpretation.
First the concepts, then the results and what they mean. Each chapter leads to the next.
Work through the basics →What are peptides?What it is and why people discuss it
How do peptides work in the body?A simple explanation with an example
How can you understand research findings?What percentages and averages mean