Apart from their actual health benefits, vitamins have played an important role in the American consciousness as the arena for a struggle between competing systems of knowledge: the positivist authority of "normal science" with its...

Vitamins are organic compounds found in foods that are necessary in human and animal diets to sustain life and health. There are thirteen vitamins that have been identified as necessary for human health, and several other vitamin-like substances also...

Vitamins are organic components in food that are needed in very small amounts for growth and for maintaining good health. The vitamins include vitamin D, vitamin E, vitamin A, and vitamin K, or the fat-soluble vitamins, and folate (folic acid), vitamin...

Vitamins are organic molecules that are needed in small amounts in the diet. They are frequently molecules that bind in the active site of an enzyme and thereby alter its structure in a way that permits it to react more readily. Vitamins serve nearly...

A vitamin is a nutrient that is an organic compound required in tiny amounts for essential metabolic reactions in a living organism.[1] Most vitamins cannot be obtained in sufficient quantities by synthesis in the body, and therefore must be obtained...

Medical disorders caused by a lack of vitamin A are rare in the United States, but in many countries a severe deficiency of this key vitamin exacts a significant toll on health. Loss of eyesight is a major hazard. The World Health Organization...

In the 1960s, when Harold Miller began taking vitamin E capsules, he also found himself taking a lot of grief from friends and coworkers. "Ah, the sex vitamin," some winked. Others were more blunt. "You're wasting your money," Miller recalls them saying. ...

You probably know that vitamin D is important for bone health. It may also help protect against colds, diabetes, and even cancer.  Vitamin deficiencies are suspected in various chronic disease states, including fibromyalgia and Chronic Fatigue Syndrome. Now there is more evidence that a...

Your parents may still tell you to take your vitamins, but a cancer doctor might be less enthusiastic. A recent study that found calcium and vitamin D supplements don't reduce the odds of developing breast cancer is the latest to deflate the...

The human body needs vitamins to maintain healthy function. Vitamins A, B, and C are three examples of the vitamins we all need, and they can be found in many common foods in our daily diet.