The study showed a huge variation in liver enzyme levels (image below), but it didnt identify any specific SNP
Klicek, R., Sever, M., Radic, B., Drmic, D., Kocman, I., Zoricic, I.,
Citations [1] Pan T, Wang N, Zhang J, et al
Another thing to bear in mind is that some animal studies have cast doubt on NAC's ability to stimulate glutathione production and even called into question its overall safety
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