The combination is generally safe and well-studied with both tirzepatide and liraglutide
State of art on the mechanisms of laparoscopic sleeve gastrectomy in treating type 2 diabetes mellitus
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S., et al., "Effects of nine weeks L-carnitine supplementation on exercise performance, anaerobic power, and exercise-induced oxidative stress in healthy trained adults", J Int Soc Sports Nutr, 2018, PMID: 30661327
Phase 2 trial (Lancet 2021) tested cagrilintide 0.3 mg through 4.5 mg/week as monotherapy and reported a clear dose-response, with 10.8% mean weight loss at 4.5 mg/week at 26 weeks
Anything between roughly 2 and 50 amino acids qualifies