Tweetif i remember correctly that Nebido by Bayer is test u and it does last for a long ass time. it is what a lot of hrt docs are trying to get ironed out to use for trt. the only down side is that it is a big shot and from all i have read hurts like a mother. for hrt i would rather just do my 1-2 a week and call it a day than deal with that kind of pain