 Z-Factor is from the makers of Relief Factor, so they've done their homework. Z-Factor is more than just melatonin developed by doctors. It's a precise formula of four all-natural ingredients that calm your mind and relax your body so you ease into sleep faster and you sleep through the night restfully and uninterrupted. You wake up refreshed, never drowsy. Rediscover the joy of a wonderful night's sleep. Try Z-Factor from Relief Factor.