b12 injection is for Compounded Cyanocobalamin (Vitamin B12) B12 Injections - Modern Edge

Patients with pernicious anemia should be instructed that they will require monthly injections of Vitamin B12 for the remainder of their lives

Glutathionylcobalamin as an intermediate in the formation of cobalamin coenzymes

Technically yes, but it is largely redundant

Medication Interactions Certain medications reduce the absorption of methylcobalamin, cyanocobalamin, and other B12 supplements, including: Proton pump inhibitors (omeprazole, esomeprazole, and lansoprazole) H2-receptor antagonists (cimetidine, famotidine, and ranitidine) Metformin Colchicine Cholestyramine Certain antibiotics (neomycin and chloramphenicol) If you use these or other medications, talk with a healthcare provider about ways to maintain healthy levels of B12.

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