Phosphorus is an important component of human bones. In fact, it is the second most abundant mineral in the body and the second most important element after calcium for maintaining bone health. In addition to providing strength to your bones and teeth, phosphorus is also essential for hormonal balance, digestion and excretion, protein production, and improved growth and cellular repair. Phosphorus is vital to growth, maintenance, and repair of all body tissue, including the brain. It also helps activate B vitamins and is a component of the storage form of energy in the body. A deficiency of phosphorus is very rare, but absorption can be reduced by the long-term and excessive use of antacids containing aluminum hydroxide. Phosphorus can be found in nuts and seeds, meat, eggs, fish, whole grains, wheat, and potatoes. Adults are encouraged to eat 1,000 milligrams of phosphorus a day.