I tried to call the number and you can be removed from their calling list.  The Doctors Group seems dedicated in helping people solve health issues when there isn't anything doctors can do for certain issues such as Tennitus.
I really wish I could talk to someone about this product.... though... haven't been home to take their calls.
       Such as life....
             I may try another number directly.... and don't which one of the products to try.   I tried the 500 mg. of
Niacin... and not working twice a day.... so what is next.  Also realized a weight supplement that I had used for sometime has a lot of coffee in it of which contributes to the problem....
              I've checked ingredients of all of the supplements that I'm taking.
                      Thanks,