While vitamin molecules and protein molecules both are essential for body development, they serve different purposes.
Vitamin molecules are unique in that only small amounts are used. These molecules also serve more as coenzymes; they help to regulate body functions such as metabolism and the immune system.
Protein molecules on the other hand are large and comprised of amino acids. They handle more of the maintenance side of the body and are vital for our growth and repair.
Vitamin and protein molecules have very different functions, but they all work toward the healing and growing of our bodies. These molecules are vital for keeping us healthy and internally stable, and without them we would greatly fall literally and figuratively.