GHK-Cu (glycyl-L-histidyl-L-lysine copper complex) is a naturally occurring copper-binding peptide that has been studied for its role in tissue repair, cellular maintenance, and extracellular matrix remodeling
Therefore, research focusing on glutathione shows that this molecule plays a major role in protecting RPE cells against oxidative stress [36,48,49,50]
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*Niacinamide which lightens dark patches by reducing melanin production
One thing worth clearing up: The scary side effects you may have heard about come from glutathione injected intravenously, which has real safety concerns
Both versions are given as small subcutaneous injections, typically in the abdomen or thigh using an insulintype syringe