It is Very similar to halodrol-50 but not the same chem. composition if you look at them both.
I have done both and got and retained more from PROM-25.
Line up your PCT before you start your cycle it is just as important as the PH itself!!!!
SNS (serios nutrition solutions) has a very effective and affordable PCT line or spend a little more for ANABOLIC EXTREME.
GOOD LUCK