Glossary -   Cystine (cys) (or L-cystine)

 

 

This is one of 20 amino acids that make up protein. It is also called "cys". It is made by the body and does not need to be eaten in the diet. It may be part of a special medical formula given to people with homocystinuria or certain other metabolic disorders. It can also be given as a supplement in pill form.