what’s too much?
From this article:
https://www.livescience.com/43566-selenium-supplements-facts.html
“The Institute of Medicine’s Food and Nutrition Board caps the safe daily intake of selenium at 45 micrograms for infants, 60 to 90 micrograms in toddlers, 150 to 280 micrograms in prepubescent children and 400 micrograms in adults.”
That article references many studies, but most don’t give a dosage.
I don’t know what’s too much selenium but I have read, I think it was Dr Mercola, the best source for your body is to eat two Brazil nuts per day. No more than two.