Conclusion Retatrutide and tirzepatide are both very potent but each comes with their own baggage
These numbers explain why tirzepatide has generated extraordinary demand and why the dosing protocols follow such a careful titration schedule: you start at 2.5 mg weekly for four weeks, increase to 5 mg, then continue stepping up through 7.5 mg, 10 mg, 12.5 mg, and potentially 15 mg depending on clinical response and tolerability
Selected adults may increase to 7.2 mg after at least four weeks at 2.4 mg when additional weight reduction is clinically indicated. The 0.25 mg dose is the starter rather than the maintenance target
Hayashi D, Edwards C, Emond JA, Gilbert-Diamond D, Butt M, Rigby A, Masterson TD
The research peptide market contains significant counterfeiting and mislabeling
Tohoku J Exp Med 2010;220:267-271