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.
1 However, clinical trials that have looked at seleniumâs role in cancer prevention have been mixed. 2  Because your body only needs a small amount of this mineral, the American Cancer Society recommends eating a healthy diet with plenty of fruits and vegetables rather than taking selenium in nutritional supplements.