can b12 be injected subcutaneously Vitamin shots taken like insulin? Best Vitamin B12 Injection Sites:

For oral B12 supplementation with a supplement like Cobalequin, 250 micrograms must be given once daily and continued initially for 12 weeks

Subcutaneous use is uncommon and dose-limited

For Animal Use Only Federal law restricts this drug to use by or on the order of a licensed veterinarian Composition::Each ml of sterile aqueous solution contains: Cyanocobalamin B12, 1000 mcg, with sodium chloride 0.8% w/v and benzyl alcohol 1.5% v/v (preservative)

Office of Dietary Supplements Vitamin B12. NIH Office of Dietary Supplements, U.S

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Use as supportive treatment during antibiotic therapy and in the prevention or treatment of debilitating conditions