Have you ever or do you? Id never heard of it being fed to horses before and just found it for sale on a womans beauty products site....with a hefty price tag. Have I missed something!?
Yes I feed it my horses, as a joint supplement, and at a fairly cheap daily price. This article on thehorse.com is good http://www.thehorse.com/ViewArticle.aspx?ID=16378 (you might need to join to see it if you aren't a member but its free, they don't spam you and there is loads of good research articles for the lay person get published on there).