It is an acronym that the poster should have defined according to standard grammatical protocol. With no insult to impimp, I had to look it up too. It is N-Acetyl Cysteine, or NAC for short.
There was another thread several days ago that gave a good link for NAC. I’ll see if I can find it.
If this whole thing were truley about public health, everyone would know what it is 19 months in to this "pandemic". As it is, the media outlets and health officials that should be promoting a prevention protocol and early treatment. Instead they are promoting a treatment that entails telling people to go home and call back if things get worse, then hospitalization, them Remedisver(sp) and a ventilator. They are killing people all in the name of money and control. Any doctor that says otherwise should have their license revoked. That goes for the FRdocs that constantly lecture us ignorant anti-Poke posters, too.