 The positive effects of tart cherry juice in Cheribundi are thought to be the result of phyto-nutrients and anti-oxidants, such as anthocyanins, melatonin and quercetin.These compounds occur naturally and are in high proportion in deeply colored fruits, such as tart cherries.Cheribundi products have been the subject of much research, with studies conducted by third parties that include the British Journal of Sports Medicine and the Journal of Nutrition.