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NAC (N-Acetyl Cysteine) Side Effects & Safety

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Safety Profile

Overall safety rating: Generally Safe

Potential Side Effects

  • GI discomfort (nausea, vomiting, diarrhea) — the most common side effect
  • Sulfurous smell and taste
  • Rare headache
  • May increase urinary zinc excretion — consider zinc supplementation with long-term use

Drug & Supplement Interactions

  • Nitroglycerin — NAC may potentiate vasodilatory effects; headache and hypotension risk
  • Activated charcoal — may reduce NAC absorption
  • Chemotherapy — consult oncologist (antioxidant concerns)
  • Zinc — NAC may increase zinc excretion; supplement zinc if using long-term

Maximum Dose

Do not exceed: 2,400 mg/day is commonly used in psychiatric trials; higher doses used under medical supervision

Full NAC (N-Acetyl Cysteine) Guide

References

  1. (). N-acetylcysteine, a glutamate modulator, in the treatment of trichotillomania: a double-blind, placebo-controlled study. Archives of General Psychiatry. DOI
  2. (). Existing and potential therapeutic uses for N-acetylcysteine: the need for conversion to intracellular glutathione for antioxidant benefits. Pharmacology & Therapeutics. DOI