Dr. Martenson has been citing studies all along. He's very good at dissecting studies and determining if they were set up right and if they prove what they claim. I got both tablets for humans and the paste tubes for horses. Another freeper said it was easy to overdose on the horse paste. I don't know. It seems like if you pay attention to the dosing which is by weight for humans and take the appropriate amount you should be fine. It's supposed to be a very safe drug.
Thanks!