L-cysteine is a non-essential amino acid

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L-cysteine ​​is a non-essential amino acid in human body. Amino acid is a constituent unit of protein. Protein is the material basis of life. It is as large as human beings to microbes, and all of them are composed of proteins. Proteins are composed of peptides, and peptide chains of peptides are composed of amino acids. Different proteins are composed of amino acid sequences of different order and length of peptide chains. Genetically related genes are actually amino acid chains of different order.
L-cysteine ​​is closely related to cystine, and two molecules of cysteine ​​form a molecule of cystine. Cysteine ​​is relatively unstable and can easily become cystine, and cystine can be reduced to form cysteine. Both of these are sulfur-containing amino acids that have an effect on skin formation and detoxification.
L-cysteine ​​is present in keratin, a major protein that makes up nails, toenails, skin and hair. L-cysteine ​​helps collagen tissue to maintain skin's elasticity and texture. It is also related to the protein of digestive enzymes. Cysteine ​​can supply the -SH group to many important enzymes in the body, such as succinate dehydrogenase and lactate dehydrogenase.
L-cysteine ​​is mainly used in the fields of cosmetics, medicine, and food. In cosmetics, it is used to prepare perm, sunscreen, hair cream and hair conditioner. In the field of medicine, it is used to prepare drugs such as methylcysteine, ethylcysteine, acetylcysteine, cysteine ​​methyl ester, cysteine ​​ethyl ester and comprehensive amino acid preparations. Cysteine ​​can be used as a protective agent for radiation damage. In terms of food, L-cysteine ​​is used as a bread fermentation aid (ripening agent), a stabilizer for milk powder and juice antioxidants, and a nutrient for pet food.