I have not heard of them, and did try to do some digging, with very sparse results. MOST of what I found was for the human variety product, and while most reviews seemed to be good, there were a couple of "didn't work" ones, as well. Now, I expect that. Not every product will work on every person, or every pet. There were NO complaints of bad side effects or such. If no one with direct experience chimes in, my best advice would be to buy the smallest amount possible, and see how it works for you. AND report back here!