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Linus Pauling Institute at Oregon State University
The term vitamin is derived from the words vital and amine, because vitamins are required for life and were originally thought to be amines.

Vitamins: Nutrition Source, Harvard School of Public Health
Dietary Insurance: A Daily Multivitamin If you eat a healthy diet, do you need to take vitamins? Not long ago, the answer from most experts would have been a resounding "no". Today, though, there's good evidence that taking a daily multivitamin makes ...

Vitamins and their functions and sources - Yahoo! Health
The tables below list the vitamins, what they do in the body (their functions), and their sources in food.

vitamin: Definition and Much More from Answers.com
Vitamins are organic components in food that are needed in very small amounts for growth and for maintaining good health.

MedlinePlus: Vitamins
Vitamins are substances that your body needs to grow and develop normally. There are 13 your body needs. They are vitamins A, C, D, E, K and the B vitamins thiamine, riboflavin, niacin, pantothenic acid, biotin, vitamin B-6, vitamin B-12 and folate.

Diet aid - Wikipedia, the free encyclopedia
In dieting, a diet aid is anything that assists in weight loss such as anti-obesity drugs, nutritional supplements, exercise equipment, portion control dinner plates or other materials.

Vitamin - Wikipedia, the free encyclopedia
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 from the diet. Thus, the ter ...