α-Tocopherol is synthesized from γ-tocopherol by the action of enzyme γ-tocopherol methyltransferase. It is the major form of Vitamin E in human plasma. It is present in sunflower seed oil. (+)-α-Tocopherol has been used: as a food supplement for juvenile cobia fish to evaluate its protective effect on bisphenol A induced oxidative stress in rats to test its chemopreventive efficacy in estrogen-mediated mammary cancer rats α-Tocopherol is synthesized from γ-tocopherol by the action of enzyme γ-tocopherol methyltransferase. It is the major form of Vitamin E in human plasma. It is present in sunflower seed oil. (+)-α-Tocopherol has been used: as a food supplement for juvenile cobia fish to evaluate its protective effect on bisphenol A induced oxidative stress in rats to test its chemopreventive efficacy in estrogen-mediated mammary cancer rats