I found this great description of the benefits of cherry juice for gout. I hope that it has the answers that you are looking for 
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Cherries have been shown to lower levels of uric acid in the blood, which is one of the most common causes of gout pain. A study at the University of California Davis showed that consuming a serving of cherries daily significantly lowered the blood uric acid levels of women by as much as 15 percent, and while the participants in the study were given fresh cherries to eat, a serving of dried cherries or cherry juice can have just as significant an impact.
The secret to the benefits of cherry juice is a compound called anthocyanins, which are the pigments that give cherries their bright red color and are also believed to be the key to helping the body relieve inflammation. As an added bonus, these same anthocyanins may significantly reduce your risk for colon cancer, the third leading cancer in America.
Doctors and scientists believe that the anthocyanins in the cherries is what caused the decrease in blood urates and what causes cherry juice gout relief. They also feel that consuming anthocyanins on a regular basis may help lower heart attack and stroke risk, and are even studying the benefits of cherry juice and how it may have direct applications to the treatment and prevention of cancer.
Black cherry juice health benefits are just as widespread and wonderful as that of tart cherries and sweet cherries, since all three varieties contain similar amounts of anthocyanins when consumed in similar amounts. No matter what variety of cherries you choose to fit your diet and tastes, all of them have the same great health benefits and are easy to find.
Since the clinical research on the cherry juice gout relief therapy is still in the early stages, there is no set "prescription" for their use or consumption. However, it seems that the majority of people benefit from consuming about two tablespoons of tart cherry juice concentrate a day, or one to two servings of fresh or dried cherries. Just like with any other type of treatment, however, different people will naturally respond differently to cherries and the end results gained will most likely be varied.
While some people report that they feel results within a few days, others do not see the full benefit until they have used cherry juice daily for several weeks or even months as part of a low purine diet.
Cherry juice gout relief has been used around the world in the treatment of this painful disease for hundreds of years, but it is only recently that the mainstream media has brought this information to light. While some people may feel a little skeptical about the benefits of cherry juice in the treatment of gout and arthritis, many more are finding that it is a wonderful way to take control of their pain and get moving again with the help of a very easy and delicious cure.