I use devils claw on my mare who had stiff back legs, she has been much better since using it. I also use cider vinigar for my other 2 elderly mares to help stiff joints. Have not used cortaflex though. Happy New Year.
i use cortaflex and devils claw as my boy is stiff in his back legs- only been using for a month or so but he does seem to be improving in the school. only problem i have is getting him to eat it- he hates the taste of the devils claw and i have to trick him into accepting it via apples/carrots etc