what is b12 injection made from B!2 Inject Kit: Package Insert / Prescribing Information Vitamin B12 shots: Uses, benefits,

People who have trouble absorbing vitamin B12 may need shots of the vitamin to treat their deficiency

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3.3 Changes in serum cobalamin by supplementation route and dosage Across 35 comparisons, the mean percentage increase in serum cobalamin following supplementation was approximately 293%, confirming the overall effectiveness of vitamin B12 interventions (Supplementary Table S4)