I was taking a probio from Amazon that had been identified as "most recommended", took it for a while but didn't really notice anything so decided to give MTN OPS a try. Used to be that my guts felt like cement, almost lifeless, and very stiff. Since I've been using BIOTICS (going on my 3rd bottle now) I feel like I have some life in my guts and I have a lot more energy. Would highly recommend to anyone looking for a probiotic supplement.