Eggs are a rich source of a few key nutrients. Eating eggs boosts your intake of choline, a vitamin important for brain function. Each large egg contains 147 milligrams of choline, about 27 percent of the recommended daily intake for men or 35 percent of the RDA for women, according to the Linus Pauling Institute. Eggs also contain selenium, an essential mineral that aids in thyroid function. Each large egg provides 28 percent of your daily selenium requirements. You also boost your intake of iodine and vitamins B-2, B-5 and B-12 when you incorporate eggs into your diet.