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A Cochrane review comparing oral and intramuscular B12 found comparable effects on blood levels, and the same principle of good absorption applies to the subcutaneous route

Administration frequency varies based on deficiency severity and individual response

In fact, B12 is so potent a factor in cell maturation that some of the original studies on it showed that cells in the bone marrow (where blood is manufactured) when deliberately deprived of B12 could mature in just a few hours when B12 was added

No, Vitamin B12 Injection requires a valid prescription from your doctor

They bind to specific receptors and trigger very precise biological responses