Introduction: What Green Walnut Husk Is and Why It Matters in Cancer Green walnut husk is the fresh outer green layer around the walnut shell, usually from Juglans regia or related walnut species. It was once treated mostly as agricultural waste, but researchers now study it because it contains juglone, polyphenols, flavonoids, tannins, and other … Continue reading Green Walnut Husk and Cancer: What Current Research Really Shows