All About Amino Acids

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Why cysteine is good for you

Cysteine is a sulphur containing non-essential amino acid, which is formed from methionine. It is necessary in the detoxification of the body from harmful toxins.

Cysteine helps protect the liver and brain from damage. It is required in the manufacture of taurine and is a component of glutathione. Skin nails and hair contain cysteine - and it is not only important in collagen production but also assists in skin elasticity and texture.


Important cysteine facts


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Groups at risk of cysteine deficiency

Deficiency of cysteine is rare, but can occur in the following individuals:

People in these groups at risk of cysteine deficiency should talk to a medical professional about cysteine supplementation BEFORE trying it.



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Symptoms of cysteine deficiency

No direct deficiencies have been reported, but in chronic diseases it seems the formation of cysteine from methionine by the body can be prevented, resulting in a deficiency.


Cysteine and health

Talk to a medical professional about cysteine supplements BEFORE taking them.


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Cysteine in food

The body can create cysteine from the amino acid methionine, so there is unlikely to be a deficiency in this amino acid. It is also found in high protein foods such as:



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Cysteine recommended daily intake (RDI)

RDA No information available
Must be taken with Vitamin C & Vitamin B6
TOXIC LEVELS No information available


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Cysteine works best with


Overdosage, toxicity and cautions for cysteine

None known, but damage to nerve cells in rats has been reported in very high dosage, and research data is still not available.


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Last reviewed: 20 June 2019 || Last updated: 20 June 2019


NOTE: Mega doses of vitamins, minerals or other nutrients cannot cure illnesses and in fact can be very dangerous and produce toxic side effects and interfere with medicine you are taking. Always ensure you consult your doctor before taking any type of amino acid supplement.
Disclaimer: This guide is not intended to be used for diagnostic or prescriptive purposes. For any treatment or diagnosis of illness, please see your doctor.

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