Selenium 30 CH (30ml)SBL Selenium Metallicum(Dilution) Common Name: Selenium, An Element. Se Causes & Symptoms for SBL Selenium Selenium acts well in debility by heat or hot weather, a little mental or physical exertion makes him sleepy. A weakness involving all parts of the body, easy fatigue from any labor, night watching, mental exertion. Headaches, caused by indulgence in alcoholics or in tea, by hot weather, by over study, strong odors. Itching in folds of skin, as