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NAC is a nutritional supplement which is an excellent source of sulfhydryl groups. NAC is more bioavailable in our body than regular cysteine. It is a precursor to glutathione and also a potent antioxidant. NAC is obtained when an acetyl group is attached to the nitrogen molecule of cysteine. Supplementing with NAC precursor helps boost glutathione production, thereby immunity and offers. Pregnant or lactating women, diabetics, hypo-glycemics and people with known medical conditions and/or or taking drugs, should consult with a licensed physician and/or pharmacist for taking dietary supplements.