Selenium is an essential nutrient for animals and humans. Selenium deficiencies can lead to muscle disorders, an increased risk of cancer, and oxidative damage to tissues. Obtaining adequate selenium is essential to health, and some sources of selenium are shellfish, tinned tuna, meat, Brazil nuts and some grains. Plants contain selenium only if it is present in the soil, and therefore assuring that commercially grown crops are grown in selenium rich soils is pivotal to providing high quality food produce. Addition of sodium selenate to soils has been evidenced to provide selenium rich plant tissues. Evidence suggests that for some plants, foliar application is also able to increase the tissue levels in certain plants such as carrots. As with plants, selenium can be added to the feedstuffs of animals and this increases the selenium concentrations in their tissues, providing higher quality food for human consumption. Feeding high selenium plants to animals is also effective at improving the tissue concentrations of selenium.
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