Strong evidenceamino_acid
N-Acetyl Cysteine for Frequent Colds
NAC replenishes glutathione, the primary intracellular antioxidant in immune cells. It also thins mucus (mucolytic), reduces viral replication, and modulates NF-kB to optimize inflammatory response without immunosuppression.
How strong is the research?
Strong evidence
Based on a randomised controlled trial (RCT) — the gold standard for establishing cause and effect.
Research source
SourceDe Flora S et al. · European Respiratory Journal 1997How much to take
600–1200 mg
NAC is well-known for respiratory immune support. Take 600mg twice daily during cold and flu season.