In the therapeutic use of this nutrient, the dosage is usually increased considerably, but the toxicity level must be kept in mind.General dosage is not known but as supplement cysteine is used at 200 mg two to three times per day.Cysteine is a sulfur containing non-essential amino acid and is closely related to cystine, as cystine consists of two cysteine molecules joined together.It 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.Toxicity and symptoms of high intake None known, but damage to nerve cells in rats has been reported in very high dosage, and research data is still being waited upon.People suffering from diabetes and cystinuria should be careful of cysteine supplements.Do not delay seeking or disregard medical advice based on information on this site.
Food sources of cysteine: The body can synthesize cysteine from the amino acid methionine but is also found in high protein foods such as poultry, wheat, broccoli, eggs as well as garlic, onions and red peppers.
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Best used with: Best taken with selenium vitamin B6 and vitamin E.When more may be required: People suffering from AIDS/HIV may benefit from cysteine in proper amounts, as low levels are normally reported in people with this problem.