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It is a type of vitamin called a cofactor, meaning it helps enzymes break down amino acids, glucose, and fatty acids to help the body function properly

Alves MR, Starling AL, Kanufre VC, Soares RD, Norton RDC, Aguiar MJ, Januario JN (2012) Selenium intake and nutritional status of children with phenylketonuria in Minas Gerais

COPIND, Chronic organophosphate induced neuropsychiatric disorder

Cysteine is described in nutritional literature as conditionally essential meaning it is not strictly essential (the body can produce it from methionine, another sulphur-containing amino acid) but the production pathway has limits, and dietary cysteine remains relevant