What is NAC?
It is an amino acid N- is the nitrogen in the molecule, attached to an acetyl group to which the Amino Acid Cysteine (do not know which isomer L or R which would be mirror images of each other- is in NAC).
L-Cysteine may perform the same function and could hardly be banned as it is available in .... nature/diet.
N-Acetyl Cysteine. Used for over 60 years. It exists for the anti-phlegm indication by prescription as MucoMyst. See: drugs.com.
This really ticks me off the FDA driving the vax business by eliminating things which prevent covid infection and also treat it if one gets it. They tried to do this with Zinc back when Rush was adverting for the Zicam lozenges for colds (which may be viral, coronavirus colds).
I found the MedCram lectures on NAC by Dr. Roger Seheult to be most informative and illuminating on this topic. He gets into the molecular organic chemistry which can be daunting and hard to understand if you aren't trained in that area. But he incorporates a lot of higher-level information as well as a lot of research citation summaries that are understandable. If you had any inorganic chemistry, it is largely understandable. He is an excellent instructor and his videos are very professional...
Coronavirus Update 59: Dr. Roger Seheult's Daily Regimen (Vitamin D, C, Zinc, Quercetin, NAC), April 21, 2020.
Coronavirus Pandemic Update 69: "NAC" Supplementation and COVID-19 (N-Acetylcysteine), May 11, 2020.
Coronavirus Update 114: COVID 19 Death Rate Drops; NAC (N acetylcysteine) Data, Oct 22, 2020.
Coronavirus Update 111: Masks; New Vitamin D Data and COVID 19; n acetylcysteine (NAC), Oct 9, 2020.
If You Get COVID 19: Optimize Immune System (Vitamin D, Monoclonal Antibodies, NAC, Quercetin etc.), January 2, 2021.