N-acetylcysteine (NAC) can bypass a rate-limiting step in glutathione synthesis by providing an acetylated form of cysteine.

“NAC plays a dual role as an antioxidant that increases glutathione production and an antidote to heavy metal poisoning.”

“and there's a supplement and acetylcysteine which kind of bypasses one of the rate limiting steps for glutathione said this is by giving you know the acetyl group on the cysteine”