The regarding glycerol needed is entirely dependent on body mass. For people weighing 125 lbs, 25 to 30 ml is necessary. For 125 to 200 lbs, 50 ml and for 200 and above lbs, 75 ml is imperative. As far as restrictions are concerned, none has been registered much which signifies that it is fda approved. Glycerol has hydrating benefits and also its potential muscle enhancing properties help it become a powerful tool for that athletes.