By Dr. Joseph Mercola | May 23, 2022
N-acetylcysteine (NAC), a form of the amino acid cysteine and a common dietary supplement, has been on the market for nearly six decades. Among its many benefits is helping increase glutathione and reduce the acetaldehyde toxicity1 that causes many hangover symptoms, but anyone who overdoses on acetaminophen (Tylenol) also receives large doses of NAC in the emergency room, as it helps prevent liver damage by increasing glutathione.
However, the U.S. Food and Drug Administration suddenly cracked down on NAC in 2020, claiming it is excluded from the definition of a dietary supplement, as it was approved as a new drug in 1963,2 before it was marketed as a dietary supplement or as a food.
Unorthodox Truth 