Instruct: Classify the given review as either positive or negative.
Query: Product should be banned.

I started using this product and got average results. My colon became very irritable after a few weeks of use. It became so bad, I could barely walk my dogs to the park without having to practically run home to the restroom. My digestive system also felt hot and acidic. I stopped using the product and after about a month the symptoms eased and finally went away. This product should be banned.