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据1998年3月美国《临床营养学》杂志发表研究报告称,怀孕妇女在怀孕后期天然维生素E向胎盘转移要优于合成维生素E。在该项研究中,研究人员让15位怀孕妇女在分娩前5～9天,每天服用剂量范围15～300mg标记氘的天然和合成维生素E。在分娩时母亲血液内天然维生素E浓度高出合成维生素E近2倍;在胎盘脐带中天然维生素E浓度高于合成维生素E近3.5倍,且这两个发现与给予定剂量多少无关。
According to a study published in the March 1998 issue of the Journal of Clinical Nutrition, pregnant women in the late stages of pregnancy are more likely to transfer vitamin E to the placenta than to synthetic vitamin E. In the study, the researchers asked 15 pregnant women to take natural and synthetic vitamin E deuterium labeled doses of 15 to 300 mg daily for 5 to 9 days prior to delivery. The concentration of natural vitamin E in the mother’s blood during childbirth is nearly twice as high as that of synthetic vitamin E. The concentration of natural vitamin E in the umbilical cord of the placenta is almost 3.5 times higher than that of synthetic vitamin E, and these two findings are not related to the given dosages.