According to the website of one such product, the safe application of traction encourages tissue cells to divide and multiply, a process called cytokinesis. Over time and with great effort this will lead to tissue growth. The FDA considers these low-risk devices (Class 1) and so provides only general controls intended to be followed by manufacturers.
4 - Use a moisturizer on the penis before the exercises and it is preferred not to use soap and shampoo as these materials will lead to redness and irritation of the penis skin . If it stays for a long period of time, in addition to dry skin, and the occurrence of cracks, it is preferred to use the Intensive Care Vaseline instead of the ordinary Vaseline as it can stay on the skin for long period of time without irritating or damaging the skin of the penis.