I receive monthly intramuscular vitamin B12 (cobalamin) injections, but my serum B12 level measured two weeks after the injection is only 268 pg mL; why is it low and how should the dosing How Long Do B12 Injections Last: 5 Ways to Extend Effects Still taking vitamin B12 injections? Move over shot. A pill may be just as good. Dr. Leslie Greenberg's Blog Vitamin B12 Injections Specialist in Langhorne, PA
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