Here's the Mechanics - NAC stimulates Glutamate, which stimulates Dopamine, the reward chemical, both directly and by reducing GABA.
By itself, NAC won't cure addictions (Gambling/Nicotine/Stims/Sex, etc.) but it's a good addition to further the effects of a Dopamine/NE Treatment Protocol.
NAC has a half life of 6.25 hours, dose at 0.6 gms or more, 3 -4X Daily.
This is a part, a small part, of how I got my brother in law off Meth, successfully, so far, after 3 months back in the Temptation World - Wellbutrin and Deprenyl and Modafinil and NAC and L-Phenyl 10 days beforehand for a baseline buildup, then he and I in a cabin in Montana,(Northern Garfield County) toughing it out with day hikes for 16 days on Coffee and Syntrax Nectar and Maltodextrin, and putting his manic ass to sleep with a half speed palm heel strike/push, Xanax and double shots of Jim Beam.
Tough Love, the Chemical Adapt and Nature Way.
I could have sliced him,tempted I was at times, left him to odor for Griz to chow on - Call me Humane, he never was aware that I was ranging back on one that was sloppy trailing our six on most days out and looking for a lazy meal.