Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Love this stuff!!!!

A couple of years ago I did a lot of research when my dog had arthritis. I threw away her $70 small bottle of Rimadyl because of the awful side effects listed on the internet and ordered Synflex. It was much more effective than the Rimadyl, and so much better for her.When my shoulder started hurting, I knew Synflex was what I needed. No research needed this time! (At the time they had one formula for pets and humans. Now they have separate ones.) After a couple of months, no pain at all! I recommended Syn-flex to a friend whose daughter had hurt her knee playing soccer. A month later, she said her daughter said "Thank you!" It helped so much.When my sister had arthritis in her hands so bad that she couldn't even unclench her fist at night, I bought her a bottle of Syn flex. She said that I could tell anyone this stuff works. This is one of the few products I would actually recommend to people.