Cysteine belongs to a group of substances known as amino acids, which serve as building blocks of protein and muscles. This amino acid is commonly found in food rich in protein and is safe for consumption and does not harm the liver.
There are different derivatives or "versions" of cysteine based on the changes to the side branch attached to the main molecule. One important antioxidant in our body known as glutathione is synthesized from cysteine.
Another version with an acetyl group attached to (otherwise known as NAC) is commonly used as a mucolytic to breakdown thick phlegm in patients with cough or asthma. In fact, it also serves as the main antidote to Panadol (paracetamol) overdose with liver injury when given in an intravenous form.
