A substance found in abundance in the oleoresins of Larrea (Chaparral) and the Guaiacum genus (Lignum Vitae). It is strongly antioxidant to lipids and is antifungal, antimicrobial and antibacterial. Both plants contain a constellation of related compounds and do not have the potential kidney toxicity found in pure NDGA...and the reason it is no longer used as an EDTA-type edible oil stabiliser in food manufacturing.