effects of too much selenium
Yes, if you get too much. Brazil nuts, for example, contain very high amounts of selenium (68â91 mcg per nut) and can cause you to go over the upper limit if you eat too many. Getting too much selenium over time can cause the following: 1  Garlic breath. 2  Nausea. 3  Diarrhea. 4  Skin rashes. 5  Irritability. 6  Metallic taste in the mouth. 7  Brittle hair or nails. 8  Loss of hair or nails. 9  Discolored teeth. 10  Nervous system problems.