Why Does Nitrous Oxide Cause B12 Deficiency? [2026 Update] King Law How Quickly Does a B12 Injection Work? Timeline and Expectations Bolt Pharmacy 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