Selenium is a vital trace mineral found in nutrient-rich foods like Brazil nuts (boasting an impressive 544 mcg per ounce!), sunflower seeds, fish, poultry, onions, and grains. Unlike plants, which do not require selenium, the selenium content in plant-based foods depends entirely on soil quality. Brazil nuts, for example, are sourced from selenium-rich soils in Brazil, making them one of the most potent natural sources.
Selenium levels in the body range from 3-6 mg in individuals from low-selenium areas to 13 mg in those living in high-selenium regions, with the liver and kidneys being its primary storage sites.
Selenium methionine is an organic form of selenium where selenium is incorporated into the amino acid methionine. It is highly bioavailable, with reported absorption rates of around 90% in the small intestine.