I used it on my mare a few years ago when she got a virus. She was just a bit lacklustre so I thought I'd give it a try. She certainly perked up nicely! I don't feed much in the way of concentrates so decided to keep her on the low dose to make sure she was getting her vits and minerals. She's still getting a little dollop in her tea 3 years on and looks very well for it.
I used it for my horse for a while (he's having problems with anaemia/high globulins etc). Didn't seem to do much for him so tried Propell-plus which seemed to help him more