compounds involving in many chemical and physiological reactions in the body. Human body cannot make vitamins by itself, except for some vitamins B that are manufactured in the intestine by normal flora.
Vitamins themselves cannot generate energy and calories. However, they have key roles in generating energy and calories from macronutrients. They involve in energy production, metabolism of macronutrients (carbohydrates, proteins, and fats), body metabolism, digestion, growth, immunity etc.
Vitamins have been categorized into two groups: water soluble and fat soluble. Water soluble vitamins are B and C. Fat soluble vitamins are A, D, E and K.
Click on them below for detailed information about vitamins, their food sources, functions, athletic and health benefits, doses and interactions of different vitamins: