DL-Selenomethionine is widely used as a dietary supplement due to its role as a source of selenium, an essential trace element. It is particularly valued for its bioavailability, making it effective in addressing selenium deficiencies in humans and animals. In agriculture, it is incorporated into animal feed to improve selenium levels in livestock, which enhances overall health and productivity. In the medical field, it is studied for its potential antioxidant properties, which may help in reducing oxidative stress and supporting immune function. Additionally, it is used in research to explore its effects on chronic diseases, including cancer and cardiovascular conditions, due to its ability to modulate cellular processes. Its application in nutraceuticals and functional foods is also growing, as it supports general well-being and metabolic health.