Canthaxanthin is a potent lipid-soluble antioxidant. Endogenous sulfur dioxide is also a potent antiinflammatory, antioxidant and cytoprotective agent. Glutathione is an important antioxidant modulated by pyocyanin. L-cysteine is a precursor to the biologic antioxidant glutathione. Celery contains phenolic acid, which is an antioxidant. Chestnut extracts were evaluated through several biochemical assays showing evident antioxidant properties. Tocopherol is described as functioning as an antioxidant. It also elevated the level of antioxidant enzymes. "N"-Acetylcysteine (NAC) is a precursor to glutathione, an antioxidant. Compounds extracted from the leaves showed anti-diabetic, antioxidant and hypocholesterolemic (cholesterol-lowering) effects in rats. Melatonin was first reported as a potent antioxidant and free radical scavenger in 1993. "Mimosa pudica" demonstrates both antioxidant and antibacterial properties. Claims are made for beneficial antioxidant effects. It is besides used as a stimulant, diuretic, antioxidant, antipyretic and relieves spasmodic asthma. Many biological functions have been postulated, including a role as a fat-soluble antioxidant.