It can be quite pricy(compared to some vitamins) but I decided to go ahead and give it a try during the racing season. I had taken it a couple of years ago but didn't stick with the regimen for long. So officially I started it Feb. 20.
There's no proof that it works but there isn't any that proves it doesn't.
The nurse told me it can take 6 - 8 weeks to feel it work. Hopefully I made a good decision.