Testosterone Undecanoate is one of the unique products manufactured by SYN Pharma. This version of Testosterone has an extremely long half life: 20 days. This means that it can be injected once every 3 weeks and still maintain stable blood levels. This product is ideal for those that travel a lot and cannot inject frequently. This injectable anabolic steroid is also a very good option for individuals that want to be on TRT while administrating injections as little as possible.