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L-Cysteine is a natural sulfur-containing essential amino acid compliant with food and pharmaceutical grade standards. It has active sulfhydryl groups, with excellent antioxidant, detoxification and protein restructuring properties. It can scavenge free radicals in the body, promote glutathione synthesis, protect liver cells and repair damaged skin tissues. In food industry, it is used as antioxidant and flour improver; in pharmaceutical industry, it is applied in liver-protecting preparations, detoxification drugs and compound amino acid formulations; it is also a common functional additive in cosmetic skin care products, featuring high safety and wide application range.