E-vitamiin on üldnimetus rasvlahustuvatele tokoferoolidele ja tokotrienoolidele. Looduslikult esineb vitamiin E kaheksas keemilises vormis (alfa-, beeta-, gamma-, ja delta-tokoferool ja alfa-, beeta-, gamma-, ning delta-tokotrienool), mille mõju inimesele on erinev.
Two main groups of compounds have vitamin E activity: the tocopherols and the tocotrienols. There are 4 isomers of each: α‐, β‐, γ‐, and δ‐tocopherols and α‐, β‐, γ‐, and δ‐tocotrienols, with differing vitamin potencies.
