Cysteine is formed from l-methionine in the liver and is a precursor to glutathione. Cysteine is an unstable nutrient and easily converts to cystine, but this does not cause a problem, since both can convert into the other - as required by the body.
Cysteine detoxifies harmful chemicals in combination with L-aspartic acid and L-citruline. Cysteine helps prevent damage from alcohol and tobacco use. It stimulates white blood cell activity.
Molecular Weight - 121.15
Occurence - 1.82%
Cysteine Food Sources
Eggs, meat, dairy products, and whole grains are high in Cysteine and Cystine. A good way to keep your cysteine level high is to eat foods that contain cysteine or methionine, the essential amino acid your body needs to make cysteine.
Cysteine Deficiency Symptoms
In chronic diseases it appears that the formation of cysteine from methionine is prevented, resulting in a deficiency.