67 citations,
January 2007 in “Environmental health perspectives” A woman's health issues were caused by arsenic poisoning from kelp supplements.
26 citations,
January 2018 in “Skin appendage disorders” Thallium, mercury, selenium, and colchicine strongly cause hair loss.
10 citations,
February 2015 in “Clinics in Dermatology” The document concludes that changes in eyelashes and eyelid skin can indicate various local and systemic diseases.
5 citations,
October 2013 in “Veterinary Clinics of North America: Equine Practice” Some horses lose hair without inflammation or itching due to various conditions, and while mainly a cosmetic issue, diagnosis requires examination and biopsies, and breeding is not advised if it's hereditary.
Selenium can be toxic to animals, causing serious health issues, especially in horses.