It is available through compounding pharmacies in the United States under physician supervision
They're given directly into the muscle for better absorption than pills
Yes, but it depends on the procedure and payer rules
B3 is also a component of the glucose tolerance factor which is released every time your blood sugar rises (helps to regulate blood sugar levels)
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In addition, once-daily administration of 1 mg oral hydroxocobalamine caused the studied children's levels of homocysteine to increase and their levels of methionine to decrease, while the reverse happened when hydroxocobalamine was given intramuscularly