Adderral is just a propiety mix of two salts of D-amphetamine, (the good stuff) and two salts of racemic amphetamine (a 50/50 mix of D, and the optical isomer L, which is bullshit), so 10 mgs Adderall contains 7.5mgs D-amphetamine (in two salts, which likely have different absorbsion rates), plus 2.5mgs of the near worthless L-amphetamine. No point to this post, except to put those years in chemistry class to use, I admit.