Urine Color After Vitamin B12 Injection How Long Does It Take to Recover from Vitamin B12 Deficiency? A physician orders Schilling Test to be performed for a client suspected of having pernicious anemia. Order the steps below in completing this procedure. 1. Give oral radioactive vitamin B12 supplement before Taking B12 for energy? The evidence says you're probably wasting your money. B12 is only powerful in one situation: when you're deficient. Not tired. Not run down. Not a bit low on