can b12 injections hurt How to Give a Injection: Step-By-Step Instructions How to Inject Vitamin B12
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Injection is introduced under the skin between shoulder blades or along the neck

Diabetics on Metformin can benefit from regular nutrient IV therapies and/or regular B12 injections to replenish their Vitamin B12 levels

doi: 10.1086/430409

Animal products are the primary sources of vitamin B12

Dietary requirements The daily requirement of vitamin B 12 has been set at 2.4 g, but higher amounts 4 to 7 g per day which are common in persons who eat meat or take a daily multivitamin, are associated with lower methylmalonic acid values