B12 injections involve the administration of vitamin B12 through an injection into the muscle or subcutaneous tissue. They are commonly used to treat B12 deficiency, pernicious anemia, and neurological conditions associated with B12 deficiency. Healthcare professionals prescribe B12 injections, help replenish B12 levels, and address related symptoms. A naturopathic doctor may give vitamin injections, including vitamin B12 injections, to address specific nutrient deficiencies or to support overall health and well-being.