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N-Acetyl L-Cysteine is a type of amino acid which is sulfur based and is needed in order for the synthesis of glutathione to take place. N-acetyl L-cysteine (NAC) is a more bioavailable form of the original L-Cysteine, another kind of sulfur based amino acid type. Unfortunately NAC cannot be found in the diet and needs to be supplemented in order to gain the full benefits. Cysteine is still quite useful alone though, as it is necessary for the sulfation cycle to take place.
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