Liver Defend™ contains four key ingredients to support healthy liver function. N-Acetyl L-Cysteine (NAC) is a unique form of the amino acid l-cysteine which has been found to support healthy tissue levels of glutathione (GSH). Alpha-Lipoic Acid is a powerful antioxidant and free-radical scavenger which plays an important role in supporting cell health. Silymarin is a beneficial standardized extract from milk thistle that helps support healthy liver function. Selenium is a trace mineral known to support the antioxidant enzyme glutathione peroxidase.