References Hartbauer, M., Hutter-Paier, B., & Windisch, M
10.1016/s1470-2045(18)30937-30939 Lancet Oncol
GHK-Cu may prevent oxidative stress in skin by regulating copper and antioxidant gene expression. Oxidative Medicine and Cellular Longevity , 2018, Article ID 3235918
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For systemic absorption, the respiratory region matters most
It circulates in your blood plasma, saliva, and urine