Long comment: Taking Selenium Supplements has found to have 50-63% reduction in Colon and Lung cancer. This has turned the tables on conventional medicine because people do not usually believe in nutrition preventing cancer. The most effective dosage of Selenium would be 200 microgram per day. The USRDA recommends 70-400 microgram a day. Going below 70 micrograms becomes deficient. The supernutritional level of 200 micrograms has proven to provide great effects against cancer.