L-Cystine disodium salt is widely used in the food industry as a nutritional supplement, particularly in products aimed at enhancing protein content and promoting healthy hair, skin, and nails. It is also utilized in the formulation of dietary supplements to support antioxidant activity and detoxification processes in the body. In the pharmaceutical sector, it serves as an ingredient in medications designed to treat conditions related to cysteine deficiency or to support liver health. Additionally, it finds application in cosmetic products, where it contributes to the strengthening and repair of hair, making it a common component in shampoos and hair treatments. Its ability to stabilize proteins and peptides also makes it valuable in biotechnology and research applications.