B9 improves your focus by improving the circulation of your blood throughout your body, especially into the brain. The University of Maryland Medical Center states that vitamin B9 aids in the production of red blood cells by helping the blood circulate. Because one of the main jobs of the red blood cell is to send oxygen through the body, a larger number of the cells will naturally lead to increased oxygen circulation throughout the body, including in the brain. Vitamin B9 can be found in peas, lima beans, asparagus, leafy dark green vegetables, fortified cereal and whole grains.
Vitamin B12 plays a significant role in the actions that are taken by both nerve cells and red blood cells. Vitamin B12 deficiencies have been found to be associated with medical conditions that may interfere with the ability to focus, such as depression, loss of energy, fatigue, low concentration levels and impaired mental functioning. The University of Michigan Health System states that vitamin B12 may help these issues and can be found in foods that are derived from animals such as meat, poultry, dairy and eggs.
