I do purchase my tart cherries frozen in a mixed cherry bag which includes tart cherries and other varieties. I found them at my local Kroger grocery store. There are also a number of benefits to tart cherry juice, which I have purchased from Trader Joe’s before. This article discusses some of the benefits of the juice: https://www.healthline.com/nutrition/10-tart-cherry-juice-benefits

I think that tart cherries in general provide a lot of benefits, which you can read more about in this article: https://www.foodnetwork.com/healthyeats/healthy-tips/2016/03/the-health-benefits-of-tart-cherries

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