topical ghk-cu vs injectable ghk-cu for Anti-Aging: Does This Copper Peptide Really Work? Are GHK-Cu Injections Safe Enough?

It might be, but we dont know yet

Cagrilintide, a long-acting human amylin analogue, exerts both central and peripheral effects by enhancing satiety, delaying gastric emptying, and modulating postprandial glucagon secretion, whereas semaglutide acts on GLP-1 receptors in the central nervous system and peripheral tissues to regulate appetite, glycemic control, and energy balance

214 Obesity induces the formation and accumulation of senescent cells in various organs, including adipose tissue, 215,216 indicating a potential mechanistic link between aging and obesity

There is no evidence that sublingual administration has any benefits over oral intake, but it may be preferable for people with swallowing problems