I've been taking 2/day of these for about 18 months, and haven't had an attack since I started. Prior to that, I was at 1-2 flares/year for 10 years.

http://www.amazon.com/NOW-Foods-Black-Cherry-Fruit/dp/B001DOOBCK/ref=sr_1_1?ie=UTF8&qid=1398797717&sr=8-1