Instruct: Classify the given review into positive or negative sentiment.
Query: worse than useless

I have been taking Sytrinol for over two months and tested my cholesterol a few days ago. I was expecting a 20-30% reduction, but instead my cholesterol reading was much higher. I took the test twice more to make sure and it came out the same. I have not otherwise changed my diet in this time, so my conclusion is that Sytrinol most likely does not work at all. It looks like a con.