Herbal Supplement 10:1 Concentrate Vegetarian Formula Wild Black Cherries (Prunus serotina) are native to North America and were extensively used by Native Americans for their therapeutic properties. The fruit was eaten fresh or used in cooking applications, and the bark was believed to have astringent properties. Wild Cherries, like many other fruits, are a naturally rich source of flavonoids. They also contain calcium salts, potassium, lignins and beneficial tannins. This vegetarian product is a 10:1 concentrate and is one of the highest potencies available.