Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Seemed to work, could just be placebo effect

I hate to burn a vacation day walking around like a zombie after an intercontinental flight, so I gave these a try. They did seem to reduce my jet lag. They taste suspiciously like the sugar pills I used to keep in my wilderness kit to offer folks suffering from something you couldn't really treat with meds ("take one of these, it'll help your bunion"). But even if it's just a placebo effect, that's still good enough for me. So read some of the glowing reviews, convince yourself these things work, and hit the ground running when you arrive.