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In user trials, 91% of participants reported a visible glow and 87% saw a reduction in pigmentation and dullness after 6 weeks of regular use
A notable double-blind RCT in 262 elderly subjects found that NAC (600 mg twice daily) for 6 months significantly reduced influenza-like episodes only 25% of NAC-treated subjects who seroconverted to influenza A developed clinical symptoms, compared to 79% of placebo subjects (De Flora et al., Eur Respir J, 1997) [40]
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