The supplements these guys are taking is to help knees and rehab. As long as the athletes are being distributed these supplements by the athletic trainer and nobody else, there is a clear chain of accountability.
Honestly, I don't want to see any team have a decisive edge because they are better at this kind of thing. No trade secrets! I'd support having trainers report the kind of supplements they use to a central NBA authority, or to have a mandate that they publish this stuff on the web or something of that sort.
Whatcha gonna do when Huxamania runs wild on you?!!