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Usually, our body gets the sufficient vitamins and nutrients from the intake of our daily diet. But, sometimes additional supplements are recommended for some people like patients of mal nutrition, pregnant and menopausal women and those suffering from mal absorption and other diseases, as for these people diet alone may not be sufficient to make up the vitamins required for the body.
So, vitamin supplements have to be taken along with the regular diet only if it is needed and in any case, taking vitamins more than as required is detrimental to the health and it may lead to vitamin toxicity.
Vitamins overuse simply means the over consumption of vitamins in excess of what the body actually needs. When vitamins are overdosed they lead to certain ill-effects, which may be both short term as well as long term. So, when one is overdosed of vitamins, he/she may immediately feel some of the effects like dizziness, diarrhea, nausea and vomiting, pain in the abdomen, headache, muscle weakness, joint pain, insomnia, increase or decrease of the blood pressure, rapid heartbeat, hair loss or sudden weight loss.
Hence, in order to avoid overdosing, one should always take vitamins only as per the dosage recommended by a doctor.