The four tocopherols (α, β, .delta., and γ) and four tocotrienols (α, β, .delta., and γ) are forms of vitamin E, which is known for its antioxidant activity.{3679} Tocotrienols are found at high concentrations in palm oil and rice bran. Recent studies show tocotrienols may be more effective antioxidants than α-tocopherol, the most abundant form of vitamin E.{14290} Compared to other tocotrienols, α-tocotrienol exhibits the most potent neuroprotective actions in rat striatal neurons. At concentrations of 0.1-10 μM, α-tocotrienol significantly suppresses H2O2-induced cell death and provides protection against S-nitrocysteine-induced cell death and SIN-1 toxicity in a concentration dependent manner.{14290} HT4 cells, that are microinjected with 10?19 mol of α-tocotrienol into the cytosolic, are protected against glutamate-induced cell death by suppressing early activation of c-Src kinase and 12-LO.{14292}