Relative to glutathione availability, one of the most important considerations has been to properly maintain the availability of cysteine in the blood as that is known to be the rate-limiting substrate for glutathione resynthesis[3]
Graham DJ, Ouellet-Hellstrom R, MaCurdy TE, Ali F, Sholley C, Worrall C, et al
A clinical trial involving sulforaphane supplements noted side effects of flatulence, constipation, and diarrhea.[ref] The clinical trials using sulforaphane can be a bit confusing because some list the amount of sulforaphane and others list broccoli extract amount, which contains more than just sulforaphane
Hay D.L., Poyner D.R
In 2022, the FDA released guidance on the use of NAC as a dietary supplement
Key Benefits* Supports natural detoxification and liver function Promotes bright, even-toned, glowing skin Helps neutralize free radicals and reduce oxidative stress Supports immune health and cellular repair Encourages collagen protection and skin clarity Aids in recycling antioxidants like vitamins C and E Enhances overall vitality and resilience *These statements have not been evaluated by the Food and Drug Administration