Not a problem!
Here is a link to their web site so you can read about it and see the all natural ingredients.
I have tried GNC products with little or no visible results. Nupro Gold is the best I have tried. http://www.nupro.com/nuproDog.html
Feeding a good, human grade, high grade dog food is recommended also. What are you feeding them?
I feed Baxter and Daisy Fromm dog food. They love it and do so well on it. I love that it is made only with high grade, all natural US ingredients and is wholly manufactured in the US. They have a puppy formula.
Bette, Baxter and Daisy