You can find N-acetyl-cysteine in our customer favorite, Super Thistle which also contains L-glutathione and milk thistle to support glutathione synthesis and liver health
Regarding plasma B12 - this is not the case, serum B12 often remains highly elevated (well over the normal range) even while symptoms return - this is why testing B12 once treatment begins is not recommended
Jafarirad S, Goodarzi R, Mohammadtaghvaei N, Dastoorpoor M, Alavinejad P
Conversely, in a recent randomized, double-blind, placebo-controlled study involving twenty healthy volunteers, a once-weekly injection of a GLP-1R agonist, dulaglutide, for three weeks did not influence HPA axis activity, showing no significant effects on circadian rhythms of blood or salivary cortisol secretion, and the level of this hormone also was not changed after the dexamethasone suppression test in comparison with the placebo-receiving group [78]