Green Walnut Husk and Cancer: A 2025 Research Guide What Is Green Walnut Husk? Green walnut husk (GWH) is the fresh green outer layer that surrounds the hard walnut shell. It comes from trees like Juglans regia (English walnut) and Juglans nigra (black walnut). Farmers used to throw it away, but research now shows this … Continue reading Green Walnut Husk and Cancer: A 2025 Research Guide