The FDC would not fight against NAC if it would be just the precursor of an antioxidant. NAC also lowers blood clotting in C19 patients, and it seems to have a positive effect in depression and bipolar disorder:
https://psychscenehub.com/video/nac-schizophrenia-bipolar-disorder/
It's an antioxidant. The FDA can fight against supplements all they want. Eat more food with antioxidants and you don't need to worry about supplementing them. High NAC foods: broccoli, onions, blueberry, egg, tree nuts, ground nuts, and meat.
N-Acetylcysteine is created by a chemical process out of L-Cysteine hydrochloride that is obtained by combining L-cysteine with hydrogen chloride. L-cysteine is found in food, hair and feathers.
Yes, that's a stable precursor of L-Cysteine, required if you want to powder and pill as a supplement. Once in the body, it is converted to Cysteine, then glutamine(edit: wrong one, it's glutathione), etc..
It's no different than using a Creatine powder, like creatine monohydrate. That is a stable form of Creatine. Once in the body, it is processed to Creatine phosphate, then adenosine, donating a phosphate to ABP creating ATP etc. Or something to that effect, I forget the full pathway. Good for high energy muscle use like lifting heavy and sprinting.
Lets remember that GNC and the supplement manufacturers make a shitload of money too.
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