I did a little research on the manufacturer's website ** and it turns out they have done a lot of research to prove that the products really do work. They have a lab in Wisconsin I believe where they test all their products to make sure they really move the markers they are testing.

I know that if you are going to purchase their products, you should definitely go to a reputable online store. My sister orders from ** and keeps ordering from there, so they must get her what she needs.

Hope this helps!

-John