L-Cysteine can be obtained from ingested protein or derived from the amino acid L-methionine.
It is adversely affected by cigarette smoking, and this some believe, is one of the reasons for accelerated skin aging in smokers.
L-Cysteine is a sulfur containing amino acid which, together with glycine & glutamic acid, forms the all-important antioxidant glutathione.

L-Cysteine also has a role to play in protein synthesis, in energy metabolism and also helps to detoxify potentially harmful chemicals. Cysteine is essential for T-cell growth & activation in the human immune system.

Skin, hair and fingernails consist mainly of Cysteine. Medicinal Cysteine may be used to:

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