The organization and daily routine of a wagon train depended on the danger expected from the Native American tribes into whose territory it had traveled, the terrain, and the size of the caravan. Mormon trains, in particular, had a semi military formation.
Side effects. Taken at normal doses, selenium does not usually have side effects. An overdose of selenium may cause bad breath, fever, and nausea, as well as liver, kidney and heart problems and other symptoms. At high enough levels, selenium could cause death.
A large (about 500 participants) double-blind, placebo-controlled study failed to find that use of selenium supplements at 100 mcg, 200 mcg, or 300 mcg daily improved mood or general well-being . 59. A study of 197 people with moderately severe asthma failed to find benefit with selenium (100 mcg daily).