In no way do I suggest that I am a nutritional expert but I have used the below for a few years and along with a good diet I find this helps my energy levels throughout the day especially the days I am training. The below is out of one of my GI diet books, [...]

Did you know Gelatin is a foodstuff largely composed of denatured collagen, a protein that is readily digested and absorbed. It is found in the connective tissue of the cartilage, hoofs, and tendons of vertebrate animals and is extracted by the action of boiling water or dilute acid. Gelatin swells to an elastic, transparent mass [...]