How long do peptide injections stay in your system?

Semaglutide has a 7-day half-life, Tirzepatide 5 days, and Retatrutide approximately 7 days. Steady-state concentrations are reached after 4-5 weeks of consistent dosing. <a href='https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6520897/' target='_blank'>Pharmacokinetics study</a>