Image: AI When people think of blueberries, they usually think of the fruit first, but the leaves also contain interesting plant compounds. Tea can be made from the leaves, and some studies focus specifically on fermented blueberry leaf tea. Fermentation means that plant material is processed in a controlled way, which can change flavor and the compound profile. One important compound in blueberry leaves is hyperoside, a polyphenol from the flavonoid group. Polyphenols are se