There is no established human dose outside the early clinical ileus study described below
Blood 111 , 57345744 (2008)
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It is one of the amino acids (20 amino acids) that, together with the others, form the proteins, that is to say that it can be synthesized in the organism from other amino acids such as valine, isoleucine or glutamic acid, however it is considered a "conditioned essential amino acid" or semi-essential since in conditions of physical or psychological stress, trauma, infection, intense training, etc., its consumption is superior to its synthesis: the body demands so much glutamine that it is not able to synthesize it in sufficient quantity
187 Similarly, higher serum concentrations of cysteine were associated with a significantly reduced risk of oesophageal squamous cell carcinomas and gastric adenocarcinomas
B12 has also been effective for treating stress