First Aid Ferr Phos is known as the First aid remedy. It is found in red blood cells and is regarded as the oxygen carrier. The more oxygen the cells receive, the more nutrients they can burn and the more energy they can release. Iron Phosphate – Ferr Phos plays a role in the creation of energy in the cells. It gives strength to the circular walls of blood vessels, especially the arteries. We must always remember that freely circulating oxygen rich blood is essential to health and life.