[skmurphy]

First of all: in mice.

Second: what are the negative impacts of alternative treatments?

Not clear what the level of impact is in humans and what the real trade-off is between better mental clarity when young/middle-aged vs. higher risk of cancer in old age. In the end we all die of something.

NAC is widely consumed, if it was a significant carcinogen you would think the effect would have been detected.

[ajb]

The study is at the level of cells, so 'in mice' doesn't seem inappropriate. But yes, this is one study and I'm not a medical researcher. This is merely one study I happen to know about; I'd rather mention it than not. If thinking about consuming NAC, please do your own research.