A version of cysteine called N-Acetyl cysteine (NAC) boosts the production of glutathione. Cysteine must come from food since our bodies cannot produce it and the two best sources are raw milk and bioactive, non-denatured whey protein. Taking NAC (at least 200mg) 30 minutes before you drink can help lessen the effects of alcohol. NAC is thought to work even better when combined with vitamin B1 (thiamine).
Unfortunately, it’s rather poorly absorbed when taken orally.