Your doctor will give you the right dosage of vitamin B12 supplement, especially if you will inject it
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Cyanocobalamin injections should be given intramuscularly, in the muscle, or subcutaneously, under the skin, as directed by your veterinarian
B12 injections, on the other hand, allow up to 100% absorption and immediate use by the body
If monthly, alternate between deltoid and gluteal sites monthly