Balancing chemical equations is a key chemistry skill. Use these step by step instructions to write and balance chemical equations. Balancing chemical equations is a key chemistry skill. Use these step by step instructions to write and balance chemical equations.
So, there are many signs and symptoms of Selenium Overdose- some occur very early and some occur much later. 1  Early Signs: Some of the early signs of Selenium Toxicity are endocrine hormone disturbances- particularly thyroid issues. Poor hair and nail growth are early signs that are probably the easiest to notice.
Other causes of low blood levels of selenium include 1  : gastrointestinal disorders or malabsorption syndromes (including food allergies) that decrease the bodyâs ability to absorb nutrients. 2  high-dose steroid therapy also affects absorption of selenium. 3  cigarette-smoking or high intake of alcohol.