I haven’t used it personally, but my instructor has – she’s very into using alternative therapies with conventional methods, and she has an aging horse who has had severe laminitis in the past.
She absolutely can’t reccomend it enough, I remember once her doing a talk on laminitis – bought up these global herbs and went on a half hour lecture about how everyone should be using herbal remedies along side vet prescribed stuff. She couldn’t recommend it enough, apparently it did her horse the world of good and she’s not had laminitis since (of course she has had all the other preventative methods put on her aswell as the herbs such as restricted grass and keeping her moving so she’s not fat).
I’m lucky my loan is very good at not getting lami – but when I first got him I was very paranoid about all those sorts of things, because he was my first horse fully in my responsibility – so I was always asking her all this stuff, and I actually still have some of the powder form stuff should I ever use it, don’t know if it’s in date these days though lol.

I think she used powder on her’s aswell – apparently it was easier to get in the horse’s feed, where as the liquid tended to smother everything.