A form of vitamin E with diverse biological activities; reduces cell death induced by hydrogen peroxide, paraquat, S-nitrocysteine, SIN-1, or BSO in rat striatal cultures from 0.1-10 µM; induces apoptosis in malignant +SA mouse mammary epithelial cells at 20 µM; reduces blood pressure and plasma lipid peroxide levels in spontaneously hypertensive rats at 15, 30, and 150 mg/kg