Outcome
    Moderate Evidence

    N-Acetyl Cysteine (NAC) for Homocysteine Reduction

    NAC lowers homocysteine modestly in some trials, likely by displacing it from protein binding.

    Overview

    NAC lowers homocysteine modestly in some trials, likely by displacing it from protein binding.

    Verdict

    Mixed evidence

    How It Works

    NAC competes with homocysteine for plasma protein binding sites and supports the transsulphuration route to cysteine.

    Dosing & Protocol

    Typical dose

    Recommended dose
    600-1200 mg daily
    Expected timeframe
    4-8 weeks

    Protocol

    form
    N-acetylcysteine capsules or effervescent tablets
    duration
    4-8 weeks, with homocysteine rechecked afterwards
    co factor
    Take away from food. If homocysteine is the target, check B12, folate and B6 status first - deficiency in these is the commonest correctable cause. Evidence is mixed. Several randomised trials and a meta-analysis report that NAC lowers plasma total homocysteine, with reductions of roughly 10-20% over weeks, plausibly because NAC displaces homocysteine from protein binding and promotes its renal clearance as a mixed disulfide. But the trials are small, effects vary, and the more important question is unresolved: large randomised trials of homocysteine lowering with B vitamins reduced homocysteine substantially yet did not reduce cardiovascular events, which argues that homocysteine is a marker rather than a causal target for most people.
    titration
    Up to 1,800 mg/day in divided doses
    starting dose
    600 mg daily on an empty stomach

    Evidence

    What the studies say

    Small randomised trials report reductions in total homocysteine of 10-20 percent with 600-1800 mg daily, though the clinical relevance is unclear and effects are less consistent than with folate.

    No studies are yet linked to both N-Acetyl Cysteine (NAC) and Homocysteine Reduction.

    Safety

    Caveats

    Nausea is common; not a substitute for correcting folate or B12 status.

    Less likely to help if

    People with normal homocysteine, and those whose elevation is driven by uncorrected B12 or folate deficiency.

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    Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.