Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not Good For Me

I only took this product twice. The first time I got a headache and head pressure. I didn't see any improvement in energy or alertness. The second time I took it the same thing again happened and, in addition, I got sick to my stomach and had to throw up. I consume caffeinated beverages and other guarana products often with no issues. For me this product was not good and ultimately ended up in the trash.