L-Cysteine Hydrochloride Monohydrate is widely used in fields of medicine, food processing, biological study, materials of chemical industry and so on.It's used as raw materials for manufacturing N-Acetyl-L-Cysteine, S-Carboxymethyl-L-Cysteine and L-Cysteine base etc.Used in the cure of liver disease, antioxidant and antidoteIt is a promotor for bread fermentation. It promotes the form of glutelin and prevents from getting ageing.Also used in cosmetic. 
 

Acetylcysteine, also known as N-acetylcysteine (NAC), is a medication that is used to treat paracetamol (acetaminophen) overdose, and to loosen thick mucusin individuals with cystic fibrosis or chronic obstructive pulmonary disease. It can be taken intravenously, by mouth, or inhaled as a mist.Some people use it as a dietary supplement.

Common side effects include nausea and vomiting when taken by mouth.the skin may occasionally become red and itchy with either form. A non-immune type of anaphylaxis may also occur. It appears to be safe in pregnancy. For paracetamol overdose, it works by increasing the level of glutathione, an antioxidant that can neutralise the toxic breakdown products of paracetamol. When inhaled, it acts as a mucolytic by decreasing the thickness of mucus.

Acetylcysteine was initially patented in 1960 and came into medical use in 1968. It is on the World Health Organization's List of Essential Medicines, which lists the safest and most effective medicines needed in a health system. It is available as a generic medication and is inexpensive.