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do b12 injections cause hypervitaminosis in autistic children From Food to Brain: The Long Journey of Vitamin Vitamin B12 for the Treatment
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doi:10.1038/178064a0

B12 also contributes to a better nights sleep, as serotonin is a precursor to melatonin, the hormone responsible for regulating sleep patterns

Serum B12 and basic hematologic tests usually provide a clear answer

Patients often notice reduced tingling, numbness, and pain after a few doses
