Selenomethionine is an organic form of the trace element selenium, which is essential for various bodily functions. It is found in certain foods, such as Brazil nuts, fish, and grains, and is often used as a dietary supplement. Selenomethionine plays a crucial role in antioxidant defense and supports the immune system. In the body, selenomethionine can be incorporated into proteins, contributing to the synthesis of selenoproteins. These proteins are important for processes like thyroid hormone metabolism and protecting cells from oxidative stress. Adequate intake of selenomethionine is vital for overall health and well-being.