In order to return your natural testosterone production back to normal, a PCT supplement is required after a prohormone cycle. Prohormones inhibit your body’s natural testosterone production, and a PCT supplement is crucial to assist you with bringing your testosterone levels back to normal. Skipping a PCT supplement, your body will retain water, you will develop gynecomastia, and your prostate may even enlarge. The mentioned supplement helps inhibit your body’s ability to produce estrogen, so, taking it is a must when using prohormones. Check the list here.