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Health Supplement
Montmorency Cherries are highly concentrated in flavonoids, Anthocyanins, which give it its red color. Because of the high concentration in this type of polyphenol, Montmorency cherry supplements are being studied more as an aid in post-exercise recovery. Studies have suggested that Montmorency cherry supplements improve performance of athletes by acting as antioxidants and anti-inflammatories. In another study, it suggests that Montmorency Cherry juice in addition to other natural melatonin producers help increase (better) sleep of athletes, helping their performance. Although it is inconclusive of the benefits provided by Montmorency cherry supplements, there has shown to be benefits and is an area of increasing study for the recovery of athletes.

see cherry juice and Health effects of phenols and polyphenols

Antioxidant Activity
Flavonoids are effective antioxidants of free radicals under test tube conditions, however; dietarily consumed, concentration of flavonoids are 100 to 1000 times less than other antioxidants such as vitamin C. When metabolically processed, flavonoids circulating are just flavonoid metabolites that have weaker antioxidant properties than before. Because of this, in vivo dietary flavonoids have small or negligible antioxidant impacts. Flavonoids also act as metal chelators, which improve those antioxidant properties because the metal ion will no longer bind to proteins. This could be beneficial for some pathological conditions, but in vivo conditions are yet to be known. Although there is little evidence to suggest that polyphenols have antioxidant properties in vivo, more studies are being done on the impact on oxidative stress post-exercise.