The sodium selenite is oxidized in a basic medium hydrogen peroxide to form a selenate, which is then spray-dried.

The molten glass is treated with sodium selenate and then arsenic trioxide to reduce the compound and provide elemental selenium.

Sodium selenate is effectively used for bio-fortification of crops hence fortifying food/feed to mitigate selenium deficiency in humans and livestock.

Chosen for its selenium content and high solubility, sodium selenate is a common ingredient in over-the-counter vitamin supplements.

[7] Controversy arose in 2009 when a group of 21 polo horses died from selenium poisoning from an incorrectly mixed dietary supplement.

[8] The US FDA and European Union currently classify sodium selenate as toxic, primarily if ingested or inhaled.

Symptoms include gastrointestinal upsets, hair loss, white blotchy nails, garlic breath odour, fatigue, irritability, and mild nerve damage.