When T-Prop is injected into the body, it cannot be readily taken up. The ester portion of the steroid has to be broken down and the hormone released from the molecular chain for it to be used. The process of breaking down Testosterone Propionate is done by a group of enzymes called esterase. The function of these enzymes is removing the ester from the steroid. The heaviness of the ester portion of the steroid affects the duration of the steroid in the body as well as how fast the steroid will induce effects. The Propionate ester is the lightest of esters that is used with Testosterone and thus is disintegrated the easiest. Since the Propionate ester is the lightest, it takes up smaller volumes and amounts in the steroid which means that one gets more volumes of the hormone as opposed to the much heavier chains of the Testosterone ethers such as Enanthate.