L-Cystine is a naturally occurring amino acid formed by the oxidation of two L-Cysteine molecules, and it is widely used in nutritional supplements, pharmaceuticals, and cosmetic formulations.

In the health and wellness industry, L-Cystine is used to support hair and nail strength, promote skin health, and enhance cellular repair. It is also included in some therapeutic formulations for its role in protein synthesis and antioxidant activity.

In cosmetic applications, it is often added to products designed to improve hair growth, strengthen brittle nails, and protect the skin from oxidative stress.