My son is on it. I give him one tsp at night. I was to begin a day time dose and haven't. I could tell it makes him sleep hard and don't want to make him drowsy during the day. We will see in July how much he's gained. I'm thinking he's gained a least three pounds. However, we are also using a wonderful food suppliment/additive by Nestle called Benecalorie. I HIGHLY recommend it as a way to get more calories and fat into a CF diet. We add a teaspoon or so at a time to a Yoplait Blueberry Yogurt. He loves it. He doesn't know its in there! Of course, I don't let him see me do it. We have also added a lot of nuts (salted cashews are a favorite). Since beginning enzymes he's not all that interested in his milk anymore. One sure way to get him to drink it is hot sauce and tortilla chips (he LOVES) or anything with just a bit of spice to it. We will drink down ten ounces of milk in nothing flat! Also, he eats a lot of bacon. It's been quite a transition from a child that ate a ton of everything to having to get just the right thing for him to want to eat it. If y'all have any further ideas regarding diet I'd love to hear them. I can't get him to touch a shake/smoothie for anything!