High-dose vitamins and supplements, once seen as harmless, now show potential for serious harm. Excessive intake of Vitamin A, D, E, Niacin, and green tea extract can damage the heart and liver. These ...

Multivitamins that contain calcium or iron can interact with tablets of the thyroid medication levothyroxine, Dr.

Vitamins are nutrients that are needed to carry out many of the body’s essential functions. According to MedlinePlus, there are 13 vitamins you need to grow and develop normally, including vitamins A ...