Glutathione is critical in the management of your voltage. When an electron donor gives up its electrons, the donor can become a stealer. Glutathione readily supplies the electrons to restore your electron donor to its donor status so it can help again.

Glutathione is not significantly absorbed from the gut, so taking it doesn’t help. However, it is made in every cell in the body by assembling the amino acids cysteine, glycine, and glutamine. Thus the key is for you to be sure to consume those amino acids.

Glutathione has multiple functions:

It is the major antioxidant produced by the cells, participating directly in the neutralization of free radicals and reactive oxygen compounds, as well as maintaining exogenous antioxidants such as vitamins C and E in their reduced (electron donor) forms.
It detoxifies many foreign compounds and carcinogens, both organic and inorganic.
It is essential for the immune system to exert its full potential, e.g.:
- Modulating antigen presentation to lymphocytes, thereby influencing cytokine production and type of response (cellular or humoral) that develops
- Enhancing proliferation of lymphocytes thereby increasing magnitude of response
- Enhancing killing activity of cytotoxic T cells and NK cells
- Regulating apoptosis, thereby maintaining control of the immune response
It plays a fundamental role in numerous metabolic and biochemical reactions such as DNA synthesis and repair, protein synthesis, prostaglandin synthesis, amino acid transport, and enzyme activation. Thus every system in the body can be affected by the state of the glutathione system, especially the immune system, the nervous system, the gastrointestinal system, and the lungs.
It is necessary for converting T4 to T3 (thyroid hormones). It is also necessary to transfer electrons from the cell membrane to the mitochondria.

Supplementing has been difficult, as research suggests that glutathione taken orally is not well absorbed across the gastrointestinal tract. In a study of acute oral administration of a very large dose (3 grams) of oral glutathione, Witschi and coworkers found that “it is not possible to increase circulating glutathione to a clinically beneficial extent by the oral administration of a single dose of 3g of glutathione.”

However, plasma and liver glutathione concentrations can be raised by oral administration of S-adenosylmethionine (SAMe), glutathione precursors rich in cysteine include N-acetylcysteine (NAC) and whey protein, and these supplements have been shown to increase glutathione content within the cell.

N-acetylcysteine is available both as a drug and as a generic supplement. Alpha lipoic acid has also been shown to restore intracellular glutathione. Melatonin has been shown to stimulate a related enzyme, glutathione peroxidase, and silymarin, an extract of the seeds of the milk thistle plant (Silybum marianum) has also demonstrated an ability to replenish glutathione levels.