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For Life Balance®Maintains Cellular HealthWith SeleniumNon-GMOKosherA Dietary SupplementHow It Works: N-acetyl-cysteine (NAC) is a stable form of the non-essential amino acid cysteine. Cysteine is a sulfur-containing amino acid that acts as a stabilizer for the formation of protein structures. Although NAC possesses its own free radical scavenging activity its primary function in the body is to supply cysteine necessary for glutathione synthesis and replenishment. This unique formula also contains selenium a trace mineral that supports glutathione production.