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For skin health, 500 mg per day is the most studied and recommended dose
The third is chemical compatibility, and it is the one most often skipped entirely
A 2016 study published in Nature Scientific Reports showed GHK-Cu produced no cytotoxicity to human keratinocytes at concentrations up to 5,800 micromolar over 72 hours and did not induce inflammatory biomarkers unlike other copper compounds
Gilron, I., Booher, S
OXIDATIVE STRESS, INSULIN SIGNALING AND DIABETES Hristov, B.D
However, not everyone is able to convert T4 to T3 properly
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