Brain tumor research is a relatively modern science that parallels the explosion of molecular biology and modern neuroimaging. While the science is new, Mayo Clinic has a long history of brain cancer treatment and research stretching back over 100 years.
But not all vitamins are water-soluble, and the ones that are lipid-soluble, meaning they like to hang around in your body's fat, don't get flushed out. Instead, if you take too much of a lipid-soluble vitamin over a few weeks to a month, they sit in the liver and can build up to toxic levels, causing problems ranging from weak bones to liver damage, according to Katherine Zeratsky, a registered dietician nutritionist at the Mayo Clinic.
Too Much Calcium. You don't need to worry about getting too much calcium from food, but you might consume too much if you take supplements. In addition to its role as an electrolyte -- which supports nerve function -- calcium aids in cell communication and keeps your bones strong. Too much calcium, though, and you might face a higher risk of kidney stones.