Alpha-tocotrienol (α-Tocotrienol, CAS 58864-81-6) is a member of the vitamin E family, specifically one of the four tocotrienol isomers (α, β, γ, δ). It is characterized by an unsaturated isoprenoid side chain with three double bonds, distinguishing it from the more common tocopherols which have a saturated side chain. This structural difference significantly influences its biological activity and physicochemical properties. Its primary application is in the fields of nutrition, dietary supplements, and biomedical research due to its potent biological activities. Alpha-tocotrienol exhibits significantly stronger antioxidant, neuroprotective, anti-inflammatory, and cholesterol-lowering effects compared to alpha-tocopherol. Research highlights its potential in supporting cardiovascular health, neuroprotection, and as an adjunct in cancer chemoprevention. It is a key ingredient in advanced nutraceutical formulations and functional foods aimed at promoting health and preventing chronic diseases. As a research-grade biochemical, it is used in life science studies to investigate cellular signaling pathways, lipid peroxidation, and mechanisms of neuroprotection. Its commercial production is geared towards the dietary supplement and functional food industries, where it is valued as a high-potency vitamin E source.