There is clear evidence for the use of B12 in diabetic neuropathy, either alone or with other treatments, and in lowering homocysteine levels, again either alone or with other nutrients
Intramuscular injections bypass the digestive system to get the vitamins where they belong, for serious results
This is because active folate (methylfolate) is required for B12-dependent reactions, and MTHFR variants can reduce folate availability
Stopping injections does not cause rebound weight gain unless you simultaneously abandon the dietary and activity changes that drove the result
I wasnt able to find any reliable evidence or details regarding whether a mild B12 deficiency can exacerbate B12 malabsorption, but the possibility raises concerns
The authors concluded that only methylcobalamin has a positive psychotropic alerting effect with a distribution of the sleep-wake cycle toward sleep reduction. More cases Heres a case of a 13 year-old boy with adrenoleukodystrophy who developed a sleep-wake disorder after a complete loss of vision