I havent used either, i did try Feedmark Ulcer Calm which was ok, however i now use Alltech Lifeforce, and so far so good, my boy finished his GastroGuard a while ago now and we havent looked back, and even better, I dont need to add anything else supplement wise to his feed with the lifeforce (although he does get fenugreek - because i had to feed it when he was ulcery)
