Whats the best Joint supplement for my 10yrold thoroughbred?

Everyone has their own opinion, but I use AniFlex Complete. It has condroiten, MSM, glucosamine and yucca along with many other things. It appears to work great for my 20 year old mare that I still barrel race. She runs just as well as she did 5 years ago. Oh, and it's pretty afforable. The higher quantity you buy, the cheaper it gets per day. AniFlex Complete costs about $48.00 for an 80 day supply.