ghk-cu copper overload risk high doses “Is actually worth it?” is genuinely one of the most common questions in my comments, so let me finally answer it properly., The short version: peptides have real research behind them, GHK-Cu (Copper Peptide) Deep Dive:

However, the American Medical Association has advised that a number of products being advertised as nootropic supplements have not been examined in terms of safety and efficacy

Pale or yellowish skin: A pale or jaundiced appearance may occur due to the effect of B12 deficiency on red blood cell production

Copper peptides, particularly those derived from tripeptide sequences such as GHK (glycyl-L-histidyl-L-lysine), have emerged as a compelling subject in research due to their hypothesized roles in tissue remodeling, antioxidant defense, and cellular signaling

& Buvat, J

There are exceptions to this but in general it is left to Pharmaceutical companies to develop medicines that can be used to treat diseases like Pernicious Anaemia