your body will always compensate for anything you do to it that knocks it off what it is used to. i figure if natural test boosters still work for people who have used steroids over the years, I am sure it will still work for someone who doesnt.
What test boosters normally do is give your body the raws and the stimulus to produce more test naturally. Its not going to blow the roof off, but its to give you an edge. As long as you dont live on them, you should be fine. Also changing up what you are using is a good deal too, because different ones will change up the ingredients a bit.
Just take your breaks from it, and it shouldn't be an issue. Dont forget though has the years go on, test drops naturally(after 25ish) so at that point it is still boosting your natural test, but now its fighting against our body slowly losing its natural output.
I think all the the above at least, am I right?