I am currently 17 years old taking this product. I know it says 18 or older, but I am almost 18 so I don't think it's a big deal. I started taking this a couple days ago, and so far so good. I already see a difference in my stomach. Some of the side effects aren't the best although. For me, I have been experiencing headache, nausea, and stomach cramps. If you have constipation, these will definitely help. My bowl movements have been softer. I think the side effects won't last long. It's just your body getting used to the prouduct. Don't judge it the first week you start taking it.