Has anybody ever used it? If so, how was results and how long did it take to see them? 

I use it daily on a mare that has had loose stools for the past year and it has helped her a lot. I had previously tried a few other things suggested by my vet, but nothing else helped. 

I just left a 2 day show with four horses, and all of them got Gut Check twice a day while we were there. 

I have a few bottles I keep on hand. I don't give it daily. One thing I can definitely say is my horses absolutely love the stuff! They will come trotting to the fence for it. I syringe it directly into their mouth. Does it work? I don't know... I haven't really dealt with severe ulcers or major gut issues. But it doesn't hurt them one bit and they are willing to take it. I will give them some when we are hauling. 

I have seen great results with CEP Gut-Check. I give it everyday before I ride and my horses stool stays consistent and their bellies are happy and ulcer free. I noticed a difference with my horses within a week but every horse is different. I have had such great success with CEP products that I just became a distributor. If you have anymore questions I am happy to help!