I also use the otc brands from Wally-World and have for several years. Works the same as the high priced brands and you don't have to mortgage your house to pay for it! You might also try a chewable Vitamin C table with the gluco/chron since it enhances the effectiveness. I did this as a "jump start" for a while when I first had Myndi and Sparky on it, but don't anymore.