From the Manufacturer's Label:
Black Walnut Hulls come from the immature fruit of the Black Walnut Tree (Juglans nigra) References to the use of Black Walnut Hulls dates back to the Ancient Greeks and Romans, and they have been used by many cultures throughout history as a n herbal tonic. The Black Walnut Tree is indigenous to the Middle East, but is currently grown in the U.S., Canada and Europe as well.
Manufactured by NOW® FoodsNot manufactured with yeast, wheat, gluten, soy, milk, egg, fish or shellfish ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.