It's good to have on hand if you run Tren or Deca.
I was on 700mg Tren Ace along with 500mg Test E\week and after about 2 weeks of the Tren my libido and erections were fine, but it was all but impossible to orgasm.
.5mg of Caber E3D cleared that right up.
Not everyone gets Prolactin sides on Tren, and they're greatly mitigated by keeping your E2 in line. But if you do, Caber does a great job of keeping them under control.