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L-Cystine (Cystine Acid) is not considered one of the 20 amino acids, L-Cystine (Cystine Acid) is a sulfur-containing derivative obtained from oxidation of cysteine amino acid thiol side chains. It functions as an antioxidant and protects tissues against radiation and pollution, slowing the aging process. It also aids protein synthesis. L-Cystine (Cystine Acid) is abundant in many proteins of skeletal tissues and skin, and found in insulin and digestive enzymes chromotrypsinogen A, papain, and trypsinogen.

L-Cystine (Standard) is a reference standard of L-Cystine suitable for quantitative analysis, quality control, and biochemical research. L-Cystine is a sulfur-containing derivative formed by oxidation of cysteine thiol side chains functions as an antioxidant, supports protein synthesis, protects tissues from radiation and pollution, and contributes to studies on aging and redox biology.