D-alpha-tocopheryl succinate is a fat-soluble ester of natural vitamin E. It stays stable in supplements, but it needs digestion to release the active vitamin.
People take it to support antioxidant defenses and protect cell membranes from oxidative stress. Absorbing it works best when you take it with a meal that contains fat.
High doses of vitamin E can interfere with blood thinners like warfarin and increase the risk of bleeding. Consult a healthcare provider before use if you take anticoagulant medications.