I found the link on the Vitamin C foundation,http://www.vitamincfoundation.org/forum/viewtopic.php?f=20&t=10809
there is no one apart from legit manufacturers like LIVON who are going to test the other competitors and it is their rebuttal to Dr Mercola's very good sales vid, which tries to make it that his Vit C is the best. I have huge respect for Dr Mercola, I just want some answers from his team, I have spent money on his product, he needs to prove that his product is real, which the independent tests from LIVON refute.