Vitamin B12 is an important B vitamin that can be found in milk, eggs, cheeses, and meats, just to name a few. This vitamin is essential for nerve function, energy, and immune system health. Folic Acid, or vitamin B9, is also important, although it can be more difficult to get through diet alone. Folic Acid is important for cell health and development, as well as for healthy hair, nails, and skin. It also works within the body to help prevent neural tube birth defects, as well as atherosclerosis. Individuals who have recently been pregnant, follow a poor diet, and who consume large quantities of alcohol are often at risk for folic acid deficiency.