I used to take N.A.C. as a health supplement it's an amino acid, and did not ever smell like sulfur, a bit like vitamins at worst. I took it on the basis it can help create glutathione, and reduce inflammation. It's actually one of the pills I will put in my mouth before finding water to drink since it tastes like a gelcap and then nothing if it dissolves. You can buy it at a health food store no dr. needed. No this doesn't mean you should od on tylenol or ever take it if you can avoid it.