<unk>  is safe in adults and in preterm infants. Although<unk>  is metabolized to<unk> tamate and ammonia, both of which have neurological effects, their concentrations are not increased much, and no adverse neurological effects were detected. The observed safe level for supplemental L-glutamine in normal healthy adults is 14 g/day. Adverse effects of<unk>  have been prescribed for people receiving home parenteral nutrition and those with liver-function abnormalities. Although<unk>  has no effect on the proliferation of tumor cells, it is still possible that<unk>  supplementation may be detrimental in some cancer types. Ceasing<unk>  supplementation in people adapted to very high consumption may initiate a withdrawal effect, raising the risk of health problems such as infections or impaired integrity of the intestine.
Glutamine
Inositol
Choline
Gluten
Nicotinamide
Cysteamine
Glutamate 
Phenserine