Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Save Money by buying Vitamin B12 Instead of Ripped Fuel

I've used this for a couple of weeks and it does work. The reason this product works is the 833% of Vitamin B12 and a little bit of caffeine. The remaining ingredients are all vitamins you can find in an average daily Vitamin pill. Save Money by buying Vitamin B12 Instead of Ripped Fuel which is 833% of your daily need.