don t have a problem with trying it. i m a little nervous that the fda doesn t regulate it. even placebo if you re using it instead of something that wears down your stomach i m fine. i don t think the stuff works that well. there is a big market out there selling this sufficient, making millions of dollars it doesn t work very well. jon: just the expense of it. i bought a big bottle, it was 120 bucks or something like that. reporter: that s the problem with supplements in general, they are not regulated. people say, oh, that sounds great we heard that that worked on somebodies dog. it s a big friend, this is going to put a little bit of a kabosh on it jon. it s over used. jon: you re saying the same thing that my doctor said to me. i said should i take this stuff? he said you can try it. if it seems to be helping fine, it can t do you any harm. reporter: it is not helping neighbor knees to heal when the