Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: This is the Best!

I, like other reviewer, had tried many different ways to fight or to prevent UTI without success until I found D-Mannose. Unfortunately, not many people know about this product. I used to take low dosage antibiotic, but it gave me yeast infection. One night, out of frustration, I searched the internet and read a discussion thread which mention D-Mannose. I decide to give a try and believe it or not, I never have UTI since.