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.
Risk of Liver and Brain Damage. Watch out for side effects when consuming certain vitamins -- vitamins A, B-3, B-6, C, D, E and K can cause adverse reactions if you consume too much, while vitamins B-1, B-2, B-5, B-9, biotin and B-12 are generally safe -- or when taking mineral supplements.