Only donors can make this possible. I was approached by a Mason this year who advised me that he owed his life because of being a blood donor and of the required blood tests required when donating. A fatal problem was found early and was corrected. I have been told this on other occasions by other people. These standards are set for your protection and to ensure the safest blood products for the patient.
High levels are a large contributing factor in clogging arteries.
Reduce the risk of colon cancer, lung cancer, and possibly bladder and esophagus cancer. Excess iron has been linked to these problems. Giving blood is quick and painless. It is also completely safe, because a new, sterile disposable syringe is used for each donor. Therefore, there is no risk of getting any disease by donating blood.