Abstract
Vitamin E, like tocotrienols and tocopherols, is constituted of compounds essential for animal cells. Vitamin E is exclusively synthesized by photosynthetic eukaryotes and other oxygenic photosynthetic organisms such as cyanobacteria. In order to prevent lipid oxidation, the plants mainly accumulate tocochromanols in oily seeds and fruits or in young tissues undergoing active cell divisions. From a health point of view, at the moment there is a great interest in the natural forms of tocochromanols, because they are considered promising compounds able to maintain a healthy cardiovascular system and satisfactory blood cholesterol levels. Some evidence suggests that the potency of the antioxidant effects may differ between natural or synthetic source of tocochromanols (vitamin E).
Highlights
Vitamin E is a fat-soluble vitamin, essential for health
Due to the difficulty in proving the efficacy of vitamin E supplementation and in order to describe evidence-based medicine results, this review provides data mainly obtained from a survey of clinical trials or systematic reviews: The Cochrane
The results indicate that single tocotrienols were bioavailable six hours after supplementation from the lower dose and that there was a trend of improved arterial compliance in all treated groups with two months of tocochromanols intake [37]
Summary
Vitamin E is a fat-soluble vitamin, essential for health. It can be stored by the body, so vitamin E does not have to be consumed every day. The vitamin E, i.e. chroman-6-ols collectively tocochromanols (tocopherols + tocotrienols), is generally ingested along with fat-containing foods [1]. Tocopherols are predominant in olive, sunflower, corn, soya beans oils, and tocotrienols are the major vitamin E components of palm oil, of barley and rice bran [3,4]. The abundance of -tocopherol in the human body and the comparable efficiency of all vitamin E molecules as antioxidants led to a neglect the non-tocopherol vitamin E molecules as topics for basic and clinical research. A survey on tocopherols and tocotrienols activity on human health is presented.
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