has Adderall been shown to enhance performance or is this a preventative measure to protect player health? what else do they check for? caffeine is probably he

has Adderall been shown to enhance performance or is this a preventative measure to protect player health? what else do they check for? caffeine is probably helpful and not banned. LSD (microdosing)? Galantamine? If there are nootropics that can legitimately enhance high level chess play why aren't we using them on our top scientists and engineers?