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.
Symptoms of overdose. 1  Bluish color of the fingernails, lips, skin, palms, or nail beds. 2  change in consciousness. 3  loss of consciousness.  no blood pressure or 1  pulse. stopping of heart. 2  unconsciousness. very drowsy or sleepy.