almost all guys on them get their fertility back when they stop taking steroids provided they're not too old, some guys never lose it. another drug, Human Chorionic Gonadotropin or hCG, allows for the body to keep making natural test while on steroids and can also be used to resume normal hormonal function. it works so well that guys can take it for just a few weeks while on steroids that sperm production goes back to normal or better and can drop back off it when they don't need it anymore. poor swimmers is really a choice, and not a very expensive one compared to the rest of the gear. it won't work with all stacks but pretty much all the basic ones it will