I have a 10 year old that has always struggled with staying regular. Her dr recommended miralax as needed but we wanted to find a better way to address it. She hates yogurt, so when I saw a chewable prebiotic, I was hopeful. As far as effectiveness, I'd rate it 5 star. She stays regular, without stomach pain, as long as she takes them. Flavor, both my children take the berry. They tolerate it but they let me know its not their favorite thing. I can live with that for the benefits. We tried the strawberry banana and they both thought it was absolutely disgusting. These are large tablets, I do believe a younger child, toddler age, would have a hard time with them. I run a daycare and to me, the size is a choking hazard for 2 to 3 year olds. I know this is aimed for 4 years and older, but keep that in consideration with the pop top and the design make it tempting and easily accessible to smaller children. Overall, im happy with them and buy them consistently, we have recommended them to other families as well