NAC is a non-essential amino acid that is man-made. It was originally developed as a medication not an OTC supplement. WebMD and other sites discuss it in general. It's sold on Walmart, Amazon + other sites. It's basically an anti oxidant. with a special benefit for brain health. Stands for N- Acytl-Cysteine.
The improvement in the quality of my brain function is noteworthy. I appreciate every gain.