Selenosis symptoms include fatigue and hair and nail damage or loss. Neurotoxic effects can include lethargy, dizziness, motor weakness and burning or prickling in the extremities.

What are the symptoms of high selenium?

The most common clinical signs of chronically high selenium intakes, or selenosis, are hair and nail loss or brittleness. Other symptoms include lesions of the skin and nervous system, nausea, diarrhea, skin rashes, mottled teeth, fatigue, irritability, and nervous system abnormalities.

How much selenium is poisonous?

The safe upper limit for selenium is 400 micrograms a day in adults. Anything above that is considered an overdose.