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.
General Fatigue. A lack of energy, while not an easily diagnosable symptom, can be caused by a selenium deficiency. Uncommon weariness, lethargy, or a general inability to perform basic physical tasks can be a warning sign of a lack of this and other nutrients in the body. 2.