ghk-cu administration methods subcutaneous topical AquaBiome (GHK-Cu) GHK-Cu for Hair Growth: Protocols
Description
confirmed an increase in skin thickness in the range of the epidermis and dermis, improved skin hydration, a significant smoothing of the skin by stimulating collagen synthesis, increased skin elasticity, a significant improvement in skin contrast and an increased production of collagen I [18,19]

You want to let them know about factors like side effects, costs, and duration of effects so they can help you choose which one to start with

Am J Respir Crit Care Med 2007;175:11861191

Changes in the composition of gut microbiota in NAFLD increased circulating plasma LPS, subsequently triggering inflammation
