Vitamins are naturally taken with food; varied diet containing healthy foods prevents shortage of vitamins. But sometimes the amounts of vitamins are not adequate and there is a need for extra amounts of vitamins and nutrients through dietary supplements.

There are many scientific researches favoring the benefits of the vitamin supplements for better health conditions.  Sometimes vitamin supplements can be dangerous for health if used before surgery, with some medicines, or if the person has certain diseases.

Vitamin supplements should contain proper levels of vitamins that a person ingests through regular food.

Vitamin A (beta carotene) and E supplements may be harmful for individuals who smoke.  The researches also show that antioxidants such as vitamins C and E curb some benefits of exercise.

In many countries dietary supplements production is regulated by the government to prevent inadequate (without prescription) consuming of them and monitor accidents that happen with overdose.

In large doses, some vitamins have side effects and overdosing can be harmful for human health.  Vitamin poisoning occurs rather often, when high dosages of some vitamins are used. The possible side-effects are nausea, vomiting and diarrhea. The doses of vitamins used should be consulted by the doctor, because the side effects can be very dangerous and in some cases they result in death.

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