However, the Academy of Nutrition and Dietetics considers plant and algae sources "unreliable", stating that vegans should turn to fortified foods and supplements instead
Certain health conditions such as intestinal or stomach problems, poor nutrition, cancer, HIV, pregnancy, old age, veganism and alcoholism can cause vitamin B12 deficiency
Some patients prefer more frequent treatments initially during periods of stress, recovery, travel, exercise training, or fatigue before transitioning to maintenance dosing
Patients who were dragging through afternoons often describe the shift as "the static turning off." Sharper mental focus and clarity B12 supports the myelin sheath that insulates your nerves, including the ones in your brain
Published human studies used different routes and dose designs