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Many women choose to use a GHK-Cu serum in the morning (under your daily moisturizer with broad-spectrum sun protection) and then use a retinol or vitamin C at night to avoid the sun sensitivity that can be caused by retinols
Cysteine availability is typically the rate-limiting factor for synthesis, which is why N-acetyl cysteine (NAC), a cysteine donor, is one of the most effective strategies for raising glutathione levels [2][9]
Kurutas EB, Cetinkaya A, Bulbuloglu E, Kantarceken B (2005) Effects of antioxidant therapy on leukocyte myeloperoxidase and Cu/Zn-superoxide dismutase and plasma malondialdehyde levels in experimental colitis
Lippincott Williams & Wilkins, 2414-2422, 2021
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