Do you pep up your daily dose of vitamins and minerals with fortified foods like biscuits, bottled water, canned juice, cereals, oats,yoghurt etc.? Along with this, if you top it with health supplements, then chances are that you may be overdoing it. Excess of vitamins and minerals may cause more harm than good. For example, too much of vitamin C may cause diarrhea, nausea or tummy cramps while excess of selenium can lead to hair loss or fatigue. It is better to ask your doctor for the dosage to avoid these symptoms.