According to traditional herbal textbooks, a tea made from blueberry leaves was considered helpful in diabetes, urinary tract infections, and poor appetite. The berries were a prized commodity among the indigenous peoples of North America.
Tannins make up as much as 10% of blueberry leaves. The astringent nature of tannins likely accounts for the usefulness of blueberry leaf in treating diarrhea. The astringent effect may also be soothing for sore throats. Some preliminary evidence indicates that anthocyanosides, the bioflavonoid complex common to bilberrry and blueberry may help people with diabetes, particularly if they have damage to the retina (retinopathy).
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