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[10] [12] The administration of Ascorbic Acid (Vitamin C) Injection is generally well tolerated, but adverse effects may occur, particularly at high doses or with prolonged use

Coskun, T

GHK-Cu directly stimulates ECM synthesis across multiple protein types simultaneously

Wound-Healing Support and Tissue Regeneration Clinical evidence demonstrates that GHK-Cu can significantly accelerate wound healing through multiple mechanisms

A safer approach is to separate strong actives from GHK-Cu at first

Vitamin C reduces melanin production while niacinamide limits pigment transfer, making them effective for dark spots and uneven skin tone