Answer
Vitamins are small organic compounds that are of great nutritional importance. They were originally named using letters of the English alphabet but also have chemical names such as ascorbic acid (Vit C) and retinol (Vit A).
The amount of each vitamin that we need for normal healthy metabolism is variable; The RDA for Vit. B 12 Cobalamin) is 0.002mg. while the RDA fir Vitamin C is 60mg. Some vitamins are obtainable from dietary sources/foods but others can be synthesized in the body. Thus Vitamin D is made by the body from cholesterol, niacin (nicotinic acid) from tryptophan and Vitamin D from carotene. Also bacteria in our gut (large intestine) some vitamins such as biotin, folic acid. one form of Vit. K and panthothenic acid.
Work Step by Step
Some sources of vitamins include citrus fruits, strawberries, tomatoes green vegetables cauliflower broccoli are good sources of Vitamin C.tamins are called water-soluble because they are absorbed with water from the small intestines and dissolve freely in aqueous body fluids. These are quickly excreted by the kidneys and are not stored in the body. Examples are Ascorbic acid (C) an the B-vitamins.
Fat soluble vitamins are incorporated into lipid micelles in the small intestine and are absorbed in dietary lipids; these are important in visual pigment compound, and proteoglycan synthesis, and in epithelial membrane maintenance.
The B Vitamins are important co-enzyme that assist enzymes in chemical catalysis. The fat soluble vitamins A and D are also very important for bone formation. Vitamin K is necessary for coagulation and A an E as anti oxidants
