In a 2018 review, researchers found evidence that taking 1,000 mcg of B12 and getting B12 injections had similar effects on treating B12 deficiencies
They are only available for a prescription if the patient has been tested and shows low levels of vitamin B12
The product is likewise indicated for increased physiologic demand (pregnancy, thyrotoxicosis, chronic hemorrhage), for drug-induced depletion, and for select neurologic or hematologic disorders in which B12 plays a pivotal metabolic role
Energy levels, mood, and cognitive function generally continue improving throughout this period
It is important to follow the injection instructions provided by a healthcare provider or pharmacist, as well as any additional instructions that may be provided by the manufacturer of the specific B12 product being used