Synopsis

Source of validity: Scientific
Rating (out of 5): 2

L-cysteine is an amino acid with antioxidant properties, often administered in the form of N-acetylcysteine (NAC), a precursor to glutathione. There is some scientific rationale for its use in supporting liver health, including hepatitis, though the level of evidence for direct efficacy in hepatitis is limited and indirect. Hepatitis, being an inflammatory condition of the liver, is associated with oxidative stress and depletion of glutathione, a key antioxidant in liver cells. NAC has been shown to replenish glutathione stores and is well-established in the management of acetaminophen-induced liver toxicity. Some studies have explored the use of NAC as an adjunct therapy in acute and chronic hepatitis (especially hepatitis B and C), suggesting potential benefits in improving liver function tests and reducing oxidative damage. However, these studies are generally small, have methodological limitations, and results are inconsistent.

L-cysteine itself (not NAC) is less commonly studied, but as a glutathione precursor, it may theoretically provide similar benefits. There is no robust clinical evidence supporting L-cysteine's use as a primary treatment for hepatitis, and it is not standard of care. Nonetheless, the antioxidant mechanism and some supportive preclinical and small clinical studies provide a scientific rationale for its adjunctive use. Overall, while there is some scientific basis, the evidence is not strong, and L-cysteine/NAC should not replace established antiviral or medical therapies for hepatitis.

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Other ingredients used for Hepatitis

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Products containing L-cysteine

Nature's Sunshine Free Amino Acids
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Nature's Sunshine Sunshine Heroes Probiotic Power
Nature's Sunshine Super Supplemental
Nature's Sunshine Super Supplemental (Without Iron)
Nature's Sunshine Super Trio
Nature's Sunshine VitaWave