Understanding NAC: A Small Supplement With Big Benefits One of the supplements I take daily is NAC (N Acetyl Cysteine)a supplement form of cysteine, a conditionally essential amino acid. Amino acids like Glutathione IV Drip Therapy Katy, TX The Woodlands, TX Is Glutathione Good for Liver Health? Exploring Its Benefits, Uses, and Side Effects IVDrips 5 Antidote: NAC (N acetylcysteine) NAC replenishes glutathione, restoring the ability to detoxify NAPQI. It's lifesaving if given early. Example: Hospitals use NAC as the standard treatment for APAP overdose.