1. Vitamin C
Vitamin C does not prevent or cure colds. Megadoses of 2000 mg or more can increase the risk of kidney stones.
2. Vitamin A
In a large study supported by the National Cancer Institute, smokers who took vitamin A were more likely to get lung cancer than those who did not.
3. Vitamin E
A large study last year of 35,533 men investigated the link between vitamin E and increased chances of prostate cancer. The Mayo Clinic, the largest integrated not-for-profit medical group practice in the world, says a regular intake of high doses of vitamin E may slightly increase the risk of death from all causes.
4. Vitamin B6
According to the National Institutes of Health, taking high levels of vitamin B6 through supplements for a year or longer can cause severe nerve damage, leading to the loss of control of physical movements.
5. Vitamin D
Researchers found that low amounts of vitamin D were the result, not the cause, of poor health.
A huge study, looking at 38,772 women over 25 years, found that the overall risk of death increased with long-term use of multivitamins.
By Lee Shin-young, Intern reporter