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While the tannins found in the blackberry fruit are in small enough quantities to be healthy without consuming too much, there are much larger amounts found in the leaves and root of the plant, which are sometimes used to make tea. There is some evidence that a massive load of tannins, like those in such teas, can potentially increase the size of tumors in cancer patients. People who have a history of cancer should avoid teas made from blackberry leaf or root.
It’s also good to minimize blackberry consumption if you’re susceptible to kidney stones, as the oxalates found in blackberries and various other fruits can sometimes increase the production of these stones.
Some people may experience mild allergic reactions when consuming blackberries, so if you notice a swelling or itching of your hands, mouth or lips upon eating the fruit, it’s best to discontinue use immediately. *
