nac precursor glutathione 1200 mg by Xymogen All About NAC (N-acetylcysteine): What
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Though considered rare, some people have reported anaphylactic responses

[DOI] [PMC free article] [PubMed] [Google Scholar] 315.Kowluru R.A
Comp Biochem Physiol C Toxicol Pharmacol 153:175190 Lushchak VI (2011) Environmentally induced oxidative stress in aquatic animals

Of all B12 forms, its the most effective one for the treatment of neurological symptoms (numbness, tingling, etc)

Indeed, treatment with the amino acid N-acetyl-L-cysteine (NAC) which is a precursor for the key glutathione synthesis substrate L-cysteine reduced 6AN toxicity by at least 50% as determined using the MTT viability assay (Figure 5(f))
