1.Made of plants, better uptake efficiency. It can be used when planting to grow selenium-enriched fruits and vegetables.2.The selenium content of China's standard selenium-rich soil is about 4600 times than Selenium-enriched soil.3. In 1973, the World Health Organization (WHO) confirmed that selenium is an essential trace element in human and animal life.4.Several thesis research have shown that selenium is related to anti-oxidation and anti-cancer.5.Selenium is toxic and needs to be absorbed and transformed by plants before being consumed.