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Vitamin B12 is water soluble and can be administered by intramuscular or deep subcutaneous injections, so regardless of whether you inject into fat or muscle, it will absorb into your body
But the way the vitamin is administered can make a real difference in how your body uses it
Gut 1991;32(10):1151-5
Rare side effects can include mild soreness at the injection site or, in some cases, an allergic reaction
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