Overview

Black walnut (Juglans nigra) is a tree native to the US that's harvested for its wood and edible nuts. The tree bark has been used in traditional medicine.

Black walnut contains high concentrations of chemicals called tannins, which can reduce pain and swelling and dry up body fluids such as mucous.

People use black walnut to lower the risk of heart disease, for skin wounds, and for other conditions, but there is no good scientific evidence to support these uses.

Tree nuts, including black walnut, are considered major food allergens in the US. Don't confuse black walnut with English walnut. There are not the same.

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