NAC = N-acetyl-L-cysteine now considered a 'medication' requiring a prescription, it's apparently the only thing which prevents damage to those who've taken the kill shot.
I just ordered two years worth (it has an expiration date of over two years on the bottle I have) at max dosage (2/day) from www.pipingrock.com , they were sold out of all except the 100 count bottles when I placed my order. From what I gather it's just a very good supplement to be taking.
https://edcdeveloper.wordpress.com/2...otein-damages/