How well does testosterone cypionate build muscle?

Very well!!!: Testosterone cypionate is very effective at building muscle assuming 1) adequate dose/level 2) adequate nutrition 3) exercise 4) previously low level. If you take a shot and then sit back in your recliner, you won't build muscle. But if you get "enough" (as documented by lab tests), combined w/good nutrition (enough protein) and regular exercise, your body should respond by building muscle.