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58 59 Nitrous oxide toxicity The Association of British Neurologists has recently issued guidance on recognising and managing nitrous oxide toxicity associated with B 12 deficiency

Vitamin B12 , or cobalamin, is a type of B vitamin

Nervous System Health Adequate B12 supports nerve function and may help prevent neurological complications related to long-term deficiency

The anticonvulsant drugs phenobarbital, phenytoin (Dilantin), and carbamazepine (Tegretol) may also lower plasma vitamin E concentrations in individuals with epilepsy (129)

Further research is required to determine the utility of serum GSH measurement as a predictor of cancer incidence

Vitamin B12 (also known as cobalamin) is a water-soluble vitamin that plays a key role in: Normal red blood cell formation Normal energy-yielding metabolism Function of the nervous system Reduction of tiredness and fatigue DNA synthesis Normal psychological function In the UK, these are recognised health claims for vitamin B12 under authorised nutrition and health regulations