Each egg contains about 7 grams of complete and easily absorbed protein, which is beneficial to aerobic metabolism and fast recovery . Eggs also contain large quantities of easily absorbed iron , which helps prevent anemia ( iron deficiency) and oxygenate the muscles during training. Eggs also include a powerful antioxidant mixture that includes selenium , Vitamin A , lutein and zeaxanthin , involved in muscle regeneration in athletes. In addition , eggs contain vitamin D which promotes bone health, as well as vitamin B12, which helps with the iron to ensure healthy blood cells.