78 citations
,
December 2011 in “Clinical toxicology” Excessive selenium from a supplement caused toxicity but patients recovered with care.
71 citations
,
June 2008 in “Annals of Internal Medicine” Excessive selenium from supplements can be harmful.
27 citations
,
June 2010 in “Journal of the American Academy of Dermatology” Excessive selenium in supplements can cause hair loss and nail issues.
12 citations
,
June 2023 in “Journal of trace elements in medicine and biology” Eating too much selenium can cause bad breath, hair loss, and nail changes, with harmful effects starting at low daily doses.
Selenium can be toxic to animals, causing serious health issues, especially in horses.