ghk cu dosage mcg How Much GHK-Cu Should You Inject Daily? Doctor Explains GHK-Cu Dosage Chart and Calculator:

The incretins: a link between nutrients and well-being

Li and Durbin, 2009

For students, researchers, and curious readers approaching GHK-Cu for the first time, the most accurate framing is that of a naturally occurring copper-binding tripeptide with substantial research literature across five decades, with well-established coordination chemistry and well-grounded connections to copper-dependent extracellular matrix biology, with substantial cosmetic-ingredient regulated use, and with ongoing research conversations about the breadth and specificity of the broader transcriptomic effects

however, there is no direct clinical evidence yet linking cagrilintide or retatrutide specifically to improvements in erectile function

Goldman Cecil Medicine, Twenty-Fourth Edition

They aren't substitutes for one another they're tools matched to different mechanistic questions in metabolic research