Some studies have tested the effects of N-acetylcysteine alone, but in people with psychiatric disorders
An animal study showed that NAC increased histamine release in conjunction with fluoride.[ref] In people given IV n-acetylcysteine in a hospital setting for acetaminophen poisoning, about 8% of the patients had an anaphylactoid reaction, defined as cutaneous (urticaria, pruritus, angioedema) or systemic (hypotension, respiratory symptoms) within five hours of receiving the IV
Glutathione and Protein, Amino Acids Because amino acids are the precursors of glutathione, and glutathione itself is comprised of three of them (cysteine, glutamic acid and glycine), the amount of protein one consumes logically influences our natural glutathione production
Be aware that B12 injections may cause muscle cramps or weakness
Many tend to have gastro-intestinal issues, they have gone through some kind of gastric surgery, they are on a very limited vegan intake diet, or they take regular pharmaceuticals for blood sugar regulation or heartburn