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NAC supplementation (600 mg/day) has been shown to improve flow-mediated dilation in patients with chronic heart failure in a small RCT (Andrews et al., J Am Coll Cardiol, 2001) [65]
Reviewers, including the Indian Journal of Dermatology, Venereology and Leprology paper on this exact topic, note that how long brightening lasts after stopping hasn't been properly studied yet treat it as maintenance, not a one-time fix
Chemically composed of three amino acids cysteine, glutamic acid, and glycine it helps neutralize harmful free radicals, supports liver function, and maintains the integrity of cells and tissues
Source References and Supplemental Research Kumar A, Palfrey HA, Pathak R, Kadowitz PJ, Gettys TW, Murthy SN