Glutathione acts as a powerful antioxidant and detoxifier that protects cells from free radicals and oxidative stress and boosts the immune system. Glutathione is required by the immune system for two important reasons: it protects host immune cells through its antioxidant mechanism and it provides the optimal functioning of lymphocytes and other cells of the immune system. The levels of glutathione in the cells of the human body begin to decline after the age of twenty. Glutathione is a powerful antioxidant composed of three different amino acids found in all cells of the body. Your body can produce glutathione in the liver however high levels of glutathione have been noted to aid in DNA syntheseis, immune function, male fertility, reducing free radicals, and fat metabolism.
The immune system works best if the lymphoid cells have a delicately balanced intermediate level of glutathione. Even moderate changes in the intracellular glutathione level have profound effects on lymphocyte functions. Certain functions, such as the DNA synthetic response, are exquisitely sensitive to reactive oxygen intermediates and, therefore, are favoured by high levels of the antioxidant glutathione. Certain signal pathways, in contrast, are enhanced by oxidative conditions and favoured by low intracellular glutathione levels. The available evidence suggests that the lymphocytes from healthy human subjects have, on average, an optimal glutathione level.
There is no direct evidence that immunological functions such as resistance to infection or the response to vaccination may be enhanced in healthy human subjects by administration of glutathione or its precursor amino acid cysteine. However, immunological functions in diseases that are associated with a cysteine and glutathione deficiency may be significantly enhanced and potentially restored by cysteine supplementation. This factor has been studied most extensively in the case of human immunodeficiency virus (HIV)-infected patients who were found to experience, on average, a massive loss of S equivalent to a net loss of approximately 4 g cysteine/d.
Two randomized placebo-controlled trials have shown that treatment of HIV-infected patients with N-acetyl-cysteine caused in both cases a significant increase in all immunological functions under test, including an almost complete restoration of natural killer cell activity. It remains to be tested whether cysteine supplementation may be useful also in other diseases and conditions that are associated with a low mean plasma cystine level and impaired immunological functions.