normal dose of vitamin b12 injection for Adults: Dosage & Frequency Neurobion Forte Vitamin B12 Methylcobalamin

Thus, the amino acid shows up in your blood after eating proteinous food, especially animal foods (meat)

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What are the considerations for intravenous Vitamin B12 administration

While you certainly can boost the amount of B12 in the foods that you eat by changing up your diet, if your issue is with absorption of the vitamin then the problem will remain

Issues like cost, availability, side effects (such as nausea), and the simple fact that obesity is a complex condition drive the search for other solutions