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While NAC is generally considered safe and well-tolerated, some individuals should avoid it, including: People with asthma (NAC may trigger bronchospasm)

Rambocas explained that glutathione inhibits the tyrosine enzyme responsible for melanin production in the skin which will result in a lighter complexion after regular sessions

Similar findings were reported in prospective clinical studies.68,69 A large multicenter RCT (n=194), however, found no significant differences with placebo.70 A meta-analysis of the above findings for a total of 480 patients showed a favorable effect on facial appearance.70 Multiple oral antioxidants and anti-inflammatory agents, such as vitamins A, C, D, and E, green tea polyphenols, niacinamide, and trace elements such as zinc may help mitigate signs of skin aging

UDP-glucuronosyltransferase 1A1 is the principal enzyme responsible for puerarin metabolism in human liver microsomes