Vitamin B12 Deficiency: Causes, Symptoms, and Treatment

B12 in their products. Certain vitamins, including B12, can affect people who have fatigue and a lack of energy. If you feel constantly tired and your levels of B12 are low, bringing them up to normal may give you more energy, studies show. But B12 supplements don’t seem to have any effect on people already at normal levels. In other words, if you’re continue reading …