Reports indicate that the FDA has sent out a series of warning letters to supplement manufacturers warning them that NAC, as it is also called, does not meet the definition of a dietary supplement because it was supposedly first approved as a "drug" back in 1963.

The FDA claims that NAC was never marketed as a food or supplement prior to the agency's approval of it as a drug. This, according to the agency, means that the "rights" to sell it are under the jurisdiction of the FDA, which is steering it towards Big Pharma entities now trying to capitalize on it as a possible Wuhan coronavirus (COVID-19) remedy.

Some 1,170 different dietary supplement products currently on the market contain NAC, as it is a popular natural remedy for treating liver side effects associated with Tylenol (acetaminophen) overdoses.