NAC SAP by Nutritional Fundamentals for Health (N-Acetylcysteine) is a precursor to glutathione synthesis and also acts on its own to reduce the effects of reactive oxygen species. NAC has been shown by studies to have a supportive effect on the liver, due to its ability to support hepatic and mitochondrial levels of glutathione and by supporting mitochondrial energy metabolism. NAC SAP Ingredients in 1 capsule: (N-acetyl-l-cysteine) 500 mg Other Ingredients: Vegetable magnesium stearate, silicon dioxide, microcrystalline cellulose, a NON-GMO vegetable capsule composed of vegetable hypromellose and purified water.