Integrative Therapeutics NAC - Antioxidant Support Supplement for Respiratory & Lung Function* - Gluten-Free & Dairy-Free - 60 Capsules (60 Servings)

Clinical trials typically use 600-1,800 mg daily. IT NAC N-Acetyl L-Cysteine Capsules (60ct) delivers 1 capsule per serving; dose per capsule not specified in Amazon listing, which we classify as Blend relative to that range.

See the "Also consider" section below for two alternatives. Choose based on form preference (Capsule vs alternatives), dose adequacy, and third-party testing.

Yes — GMP Certified. Third-party testing verifies ingredient identity and label accuracy.

Yes — Amazon Subscribe & Save is available for this product. Enrolling locks in a recurring delivery at a reduced per-unit price.

NAC can interact with nitroglycerin, potentially causing additive vasodilation and severe headaches. It may affect the activity of some chemotherapy agents. At high doses, NAC can affect platelet function. Consult your physician if on nitrates, blood thinners, or receiving cancer treatment.

NAC is generally well tolerated at supplemental doses (600-1800mg/day) for extended periods. The most common side effects are GI related (nausea, diarrhea). Rare bronchospasm has been reported in asthmatic individuals. Long-term use at standard doses is considered safe in clinical settings.

NAC can cause nausea, vomiting, or diarrhea in some users, particularly at higher doses. Starting with once-daily dosing and taking with food reduces GI side effects. The sulfur smell and taste are inherent to NAC — not a quality issue but a characteristic of the compound.

NAC pairs naturally with glycine and glutamine for complete glutathione synthesis support. It combines well with vitamin C for synergistic antioxidant support. Avoid combining with high doses of activated charcoal without clinical reason. Compatible with most daily vitamins and minerals.

Take 1 capsule daily or as recommended by a healthcare professional. Taking with food reduces GI effects. Adequate hydration supports NAC efficacy for respiratory applications. Avoid use immediately before surgery. Individuals with cystinuria should consult their physician before use.

Glutathione levels respond to NAC supplementation within 2-4 weeks of consistent use. Respiratory comfort improvements may be noticed within 1-2 weeks. Antioxidant and liver support benefits are cumulative and best assessed after 4-8 weeks of daily supplementation.