This is just an opinion on some OTC supplements that can be had and not necessarily about what Grier may or may not have taken but some of those carry harsh side effects. I looked into some of the legal prohormones at one time because of the way the liver processed it into what is basically an anabolic steroid. It was legal due to the way the manufacturers constantly changed the chemical properties of the supplements to stay one step ahead of a ban on their product. However, they still carried all the potential side effects of taking the real stuff which is the reason I didn't take it.
Read the forums and you will see that loads of people absolutely don't care if they get acne, male patterned baldness is accelerated, risk of gyno and stunted natural testosterone production which is supposedly an increased risk when you are still young.
The government finally found a way to ban them and I think SARMS are one alternative that some people are using. The side effects are supposedly less harsh than prohormones/steroids but it is still recommended to use meds for post cycle therapy from the article I read. There is also the risk of yellowed vision which sounds like it would sorta suck.
I think people tendencies to get a abuse these products is reason enough for a ban. Student athletes, or any athlete, shouldn't have to risk some weird side effects to keep up with someone who doesn't care.