NAC is the rate-limiting precursor to glutathione
N-acetylcysteine supplies the cysteine needed to synthesize glutathione, the body's primary intracellular antioxidant. Oral glutathione has poor bioavailability, so raising glutathione via NAC is usually more effective.
600-1200mg NAC daily is typically more effective than oral glutathione for raising cellular glutathione levels.
Take NAC on an empty stomach
NAC is the rate-limiting precursor to glutathione. 600-1200mg NAC daily is typically more effective than oral glutathione for raising cellular glutathione levels.
Take NAC on an empty stomach
This interaction is rated “Synergy” by Formulate. N-acetylcysteine supplies the cysteine needed to synthesize glutathione, the body's primary intracellular antioxidant. Oral glutathione has poor bioavailability, so raising glutathione via NAC is usually more effective.
Studies from our registry that mention both glutathione and nac. Each links to the primary source and the other Formulate pages citing it.
Both substances · 2011
N-acetylcysteine in psychiatry: current therapeutic evidence and potential mechanisms of action
Dean O, Giorlando F, Berk M · Journal of Psychiatry and Neuroscience
Reviews evidence for NAC as an adjunctive psychiatric treatment, with strongest data in trichotillomania, OCD, addictive behaviors, and as a glutathione precursor for oxidative stress reduction.
Mentions nac · 2008
Effectiveness of N-acetylcysteine in the prevention of contrast-induced nephropathy: a systematic review and meta-analysis
Kelly AM, Dwamena B, Cronin P, et al. · Annals of Internal Medicine
Meta-analysis of 41 trials found NAC associated with reduced risk of contrast-induced nephropathy, supporting clinical use of NAC for renal protection in high-risk patients undergoing contrast imaging.
Guide
NAC Supplement Guide 2026 | Evidence-Based Overview
NAC is your body’s most efficient glutathione precursor. Explore clinical evidence on dosing, OCD, liver protection, and who benefits most from supplementing.
Review
NAC and Alcohol: The Liver Protection Timing Question
NAC genuinely protects the liver from alcohol damage, but ONLY when taken before drinking. Here's the evidence-based protocol and why post-drink timing fails.
Roundup
Best Supplements for PCOS: Evidence-Based Stack (2026)
Inositol, NAC, vitamin D, and magnesium all have meaningful PCOS evidence. Here's which ones actually move insulin, cycles, and fertility — and at what doses.
Roundup
Best Supplements for Fatty Liver (NAFLD): What the Evidence Shows
NAC, vitamin E, omega-3, and milk thistle all have NAFLD evidence — but quality varies wildly. Here's which actually reduce liver enzymes and fat.
Other interactions to know
Check your full stack in the free interaction checker.
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Medical disclaimer. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.
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