 Collagenate is all natural, doesn't conflict with any medications. Of course, if somebody has a concern, they can call us or they can check with their doctor or they can have their doctor call us. We do have doctors that carry collagenate, but of course a lot of times there are other doctors that aren't familiar with it. So if their doctor is not familiar, they can always call us or just look at the ingredients and see that there's really nothing in it that's going to conflict with medications or diseases. Very good. And another question we always get from time to time here, Carla, is do people need to exercise to make collagenate work?