Regular acne is driven by a bacteria called Cutibacterium acnes, clogged pores, and excess oil
This means that while GHK-Cu could provide some local free copper to inhibit 5AR1 in the scalp or sebaceous glands, the effect is unlikely to be as strong or predictable as pharmaceutical inhibitors like finasteride or dutasteride
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This introduces a massive, uncontrolled variable into your work
Ding D, Du B, Zhang C, Zaman F, Huang Y
Food Chem Toxicol 51:1525 Thu ZM, Myo KK, Aung HT, Clericuzio M, Armijos C, Vidari G (2020) Bioactive phytochemical constituents of wild edible mushrooms from Southeast Asia