It is really for on cycle support IMO.
Its got preg. and DHEA in it.
These are so mild as not to be suppressive for test HOWEVER DHEA will cause a shift in your cortisol response. It can cause suppression of cortisol, 7-keto is different but I can't remember if it is more suppressive or more less.
So providing you are not on it for more than 2-3 months (very debatable).