can i use ghk cu with tretinoin GHK-Cu/Estriol/Niacinamide/Tretinoin Cu-GHK vs Tretinoin: The Anti-Aging

A comprehensive review of preclinical toxicology in animals with and without diabetes by European and US regulatory authorities found no evidence of incretin-associated pancreatic toxicity

So you have no issues with injecting the full 1ml subcutaneously into the belly

Triple-Hormone-Receptor Agonist Retatrutide for Obesity Weekly retatrutide injections (1 mg12 mg) resulted in weight reductions of 7.217.5% at 24 weeks and 8.724.2% at 48 weeks in subjects with overweight or obesity (without T2DM) in a phase II, double-blind, randomized, placebo-controlled [125]

Assisting in drug metabolism , ensuring the breakdown of pharmaceutical compounds