I'd like to chime in here about the whole "hurting kidneys" comments.
I've done a lot of research on the subject, from posts on other sites to direct conversations with others very experienced with M1T to my own personal experience with a couple of cycles. I have to say the pain you all are experiencing is NOT your kidneys, it is the muscles in your lower back, which get constant use from every day use - much more than any other muscle group. It seems when a muscle is called upon for "endurance" use while on M1T, it is much more prone to that M1T "pump" we've all experienced, and thus tightens up and becomes sore.
Think about it, there are about a dozen comments on this thread alone such as the following:
My kidneys/lower back is sore when I work back or legs, and also when I do cardio. When I am not working out I barely notice it.
Working back or legs will create the pump, cardio for endurance (using lower back constantly) creates the pump as well .... hell, just every day walking, gettin up, moving around utilizes these muscles to the point where they get this pain type pump.
A couple of more points to support that statement: 1) Talk to anyone who's ever had a bruised kidney - the pain is more to the side, a little higher and definately a very deep internal feeling ... not a back pain, but an "inside discomfort" where you positively know it's an organ hurting. 2) If kidney pain was this easy to stimulate (such as taking something "toxic" like M1T) every time you went out and drank you'd wake up with that pain ... be honest, some have been down right near alcohol posioning in one of those "days gone by" stupid all night drinking binges and while you faced the head pain and overall crappy feeling your kidneys didn't hurt. That amount of alcohol is definately way, way more toxic to your system than 20 mg. of M1T is. Hell, apply that to any substance you put into your body that isn't exactly healthy ... your kidneys just don't hurt from it passing through. 3) I had a friend who one day took a piss and blood came out ... he went to the doctor and found out he had cancer so bad in his kidneys they immediately took one out. The guy was dumbfounded ... he had never felt any pain or discomfort EVER to indicate such a problem existed. Hell, if that amount of cancer won't cause pain in the kidney, then 20 mg. of M1T first passing through the liver, loosing some of its potency, passing through your bloodstream and finally some residual waste getting into your kidneys won't cause pain.
Last point ... use another muscle for endurance while on M1T and you'll feel that pump or pain you're describing. The last time I was on, I had a 30 minute phone conversation and when I hung up the phone my left bicep (holding the phone up to my ear with my left arm) absolutely cramped up and pumped up in pain for the next hour or two. The problem is your lower back gets very little rest from everyday use ... thus most prone to the discomforting pump.