Vitamin E is part of a house of eight compounds, tocopherols and tocotreinols with their variants, alpha, beta, gamma and delta. These compounds have a basic chromanol ring (chroman ring with an alcoholic hydroxyl group) and a 12-carbon aliphatic side chain containing methyl groups. These structures can be modified spatially, and this asset of organic compounds to have different structures but same combination is called isomerism.
Alpha-tocopherol has two isomers, d-alpha and l-alpha, the structures like that of the two hands, hence the letters "d" and "l", meaning dextro (right in Greek) and levo (left in Greek). Natural vitamin E is made of d- forms, and artificial ones are modified spatially to form l-forms, and they include both d and l, often referred as dl-forms.
Vitamine
The disagreement between the natural and artificial forms is underlined by the fact that the body recognizes only the d form. Also the l form inhibits the d form from entering the cell membranes. Hence, the artificial form should be avoided.
Bioavailability is the number of a combination or substance available for the biological functions of the body; the less the number, the more the wastage of the substance. Since the d form is the isomer beloved by the body, its bioavailability is higher than that of l form. Therefore, natural vitamin E supplements, which have the d-form of tocopherols, have greater bioavailability than the artificial forms, which have all the isomers, i.e. The d and l forms of alpha, beta, gamma and delta. Natural vitamin E is twice as potent as the artificial form, for instance 67 milligram (mg) of alpha-tocopherol is equivalent to 45 mg of dl alpha-tocopherol.
According to the explore done in the National explore Council of Canada, the preference of d form over l form is shown by higher proximity of vitamin E in brain, lungs, heart and muscles. Hence, it is advised to take natural vitamin E, even though it costs twice as much as artificial vitamin E.
Natural Vitamin E
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