commonly confusing Q - What is Vitamin and why is it so important?

Some answers can be found from here...

http://health.howstuffworks.com/multivitamins-good-for-me.htm

http://health.learninginfo.org/index.htm

http://www.medicinenet.com/vitamins_and_calcium_supplements/article.htm

http://findarticles.com/p/articles/mi_m0NAH/is_2_33/ai_97177918/