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Safety and side effects: A meta-analysis of multiple studies in COPD patients showed no significant adverse effects at doses ranging from 600 mg to 3g/day.[ref] Studies in healthy adult athletes go up to 20g/day (not recommending this, just including it for safety).[ref] Conversely, in Parkinsons patients, there was a high number of adverse events at 6g/day of NAC

Jacobson A, Lam L, Rajendram M, Tamburini F, Honeycutt J, Pham T, Van Treuren W, Pruss K, Stabler SR, Lugo K, Bouley DM, Vilches-Moure JG, Smith M, Sonnenburg JL, Bhatt AS, Huang KC, Monack D (2018) A gut commensal-produced metabolite mediates colonization resistance to salmonella infection

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