Well, the problem with anything over the counter is that the military didn't prescribe it, so they don't know what is in it. They haven't screened their test to remove that legal hormone from potentially causing someone to come up positive on a UA test.
I can tell you now, if the test says that you've come up positive, it will be for steroids and they will try to kick you out. That is just the normal response. Even if you have the bottle in hand, they'll assume illegal steroids, because that is al their test is supposed to capture (though it can capture other, legal things).
If you have more than 6 years in service or they go for an other than honorable discharge
(unlikely), you'll have the opportunity to present the OTC drug to them as the reason for the postive result. The board will then decide what to do.
If you aren't entitled to a board, only your chain of command will be involved and they'll decide what to do.
My point is that, only in a board setting, will you get to present the OTC as a defense and even then it is not an automatic defense to the allegations. They can still separate you, if they choose to.
This is why I NEVER recommend to people that they should take any supplement at all while in the military. You just never know what they all contain.