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The landmark PANTHEON trial, a 1-year multicenter RCT in 1,006 Chinese COPD patients, found that high-dose NAC (600 mg twice daily) reduced the rate of acute exacerbations by 22% compared to placebo (1.16 vs 1.49 exacerbations per year, p=0.0011) (Zheng et al., Lancet Respir Med, 2014) [44]

Vita Complex (B-Complex Vitamins) What it is: The Vita-Complex blend is comprised of multiple essential B vitamins: thiamine (B1), riboflavin 5 phosphate (B2), niacinamide (B3), dexpanthenol (B5), and pyridoxine (B6)

Yes, it is often recommended for repeated daily use

the choice between pre-bed and fasted morning is secondary and is treated in the research framing as a matter of fit with the rest of the day