Cysteine is an amino acid that is found in most proteins. As an antioxidant, cysteine works to fight free radicals and is known to detoxify the body as well as protect it from radiation damage caused by radiation cancer treatments.

Cysteine can be added to your diet by consuming high protein foods like poultry, eggs, wheat and red peppers or by taking a supplement. Discuss taking a cysteine supplement with your doctor before adding it to your diet.

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