Durabolin (Nandrolone)® is a muscle enahancer that is very needed in cutting and bulking cycles. Oregon Labs brand is called Dura 50 which helps you keep the muscle that you gained after a cycle. This product is a must for those seeking pure muscle build-up and a more solid look. You will be very pleased with Dura-50 caps. Novices and less advanced achieve rapid strength and pure muscle gain quick. Dura 50 causes the muscle cell to store more nitrogen than it releases so that a positive nitrogen balance is achieved.