Toxicology
The FDA and European Union currently classify sodium selenate as a toxic chemical, primarily if ingested or inhaled. Testing on rats showed a dose of 1.6 mg/kg to be deadly. Chronic exposure to sodium selenate can cause severe lung, kidney, and liver damage.
In studies investigating the antigen properties and dosage of sodium selenate, patients demonstrated a good tolerance to doses upward to 45 mg per day with a maximum tolerated dose of 60 mg per day. Side effects include nail disorder, alopecia, muscle spasms, and nausea. Increased side effects, notably nausea and fatigue, were experienced at higher doses but were attributed to the buildup of selenite.
Read more about this topic: Sodium Selenate