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Vitamin E (high-dose)
supplement Under reviewVitamin E refers primarily to a group of fat-soluble compounds with antioxidant activity, of which alpha-tocopherol is the main form used in human supplements. High-dose vitamin E usually means intakes far above the recommended dietary allowance, commonly 400 IU per day or more, typically as isolated alpha-tocopherol in softgel capsules. Vitamin E acts mainly as a chain-breaking antioxidant in lipid membranes, protecting polyunsaturated fatty acids in cell membranes and lipoproteins from oxidative damage. By donating electrons, it helps neutralize free radicals and can influence cell signaling, gene expression, and immune function. However, when taken in high doses, alpha-tocopherol can disrupt the balance with other lipid-phase antioxidants, interfere with vitamin K–dependent coagulation, and potentially alter apoptosis and cell proliferation. In general health applications, modest dietary intake of vitamin E from foods is important for maintaining normal antioxidant defenses and preventing deficiency. In contrast, chronic high-dose supplementation in otherwise healthy adults has not shown convincing preventive benefits for cardiovascular disease, cancer, or overall mortality, and has been linked in several large trials and meta-analyses to small but measurable increases in all-cause mortality and certain cancer risks, particularly prostate cancer in men.
Research summary
Large randomized trials and meta-analyses including tens of thousands of mostly middle-aged and older adults have found that high-dose vitamin E supplementation does not reduce all-cause mortality, major cardiovascular events, or overall cancer incidence in generally healthy or at-risk populations. Some dose–response analyses report a trend of increasing all-cause mortality risk at intakes above roughly 150 IU per day, with statistically significant adverse signals at or above about 400 IU per day in several pooled analyses. The most notable specific harm signal is an increased risk of prostate cancer in men taking 400 IU per day of synthetic alpha-tocopherol, observed in the SELECT trial. High-dose vitamin E also raises concern for excess bleeding due to interference with vitamin K–dependent coagulation, especially when combined with anticoagulant or antiplatelet drugs. Overall, current evidence and major expert reviews conclude that high-dose vitamin E supplementation offers no proven prophylactic benefit for healthy adults and may carry small but real risks, so its routine use for disease prevention is generally discouraged.
Reported Benefits
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Assessment of the safety of high-dose, short-term supplementation with vitamin E in healthy older adults.
Meydani SN, Barklund MP, Liu S, et al.
Reported Side Effects
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Meta-analysis: high-dosage vitamin E supplementation may increase all-cause mortality.
Miller ER, Pastor-Barriuso R, Dalal D, Riemersma RA, Appel LJ, Guallar E
Vitamin E supplementation, cardiovascular events, and mortality: evidence from randomized clinical trials
Eidelman RS, Hollar D, Hebert PR, Lamas GA, Hennekens CH
No reports yet
Be the first to report this effect and help the community.
Add Vitamin e (high-dose) to your stack to report effects
Meta-analysis: high-dosage vitamin E supplementation may increase all-cause mortality.
Miller ER, Pastor-Barriuso R, Dalal D, Riemersma RA, Appel LJ, Guallar E
Vitamin E supplementation, cardiovascular events, and mortality: evidence from randomized clinical trials
Eidelman RS, Hollar D, Hebert PR, Lamas GA, Hennekens CH
Related health conditions
Research showing how this habit affects specific health conditions. Always consult healthcare professionals.
May Worsen
Coronary artery disease or other cardiac conditions
Meta-analysis: high-dosage vitamin E supplementation may increase all-cause mortality.
Miller ER, Pastor-Barriuso R, Dalal D, Riemersma RA, Appel LJ, Guallar E
Vitamin E supplementation, cardiovascular events, and mortality: evidence from randomized clinical trials
Eidelman RS, Hollar D, Hebert PR, Lamas GA, Hennekens CH
Research (3 studies)
Meta-analysis: high-dosage vitamin E supplementation may increase all-cause mortality.
Miller ER, Pastor-Barriuso R, Dalal D, Riemersma RA, Appel LJ, Guallar E
Vitamin E supplementation, cardiovascular events, and mortality: evidence from randomized clinical trials
Eidelman RS, Hollar D, Hebert PR, Lamas GA, Hennekens CH
Assessment of the safety of high-dose, short-term supplementation with vitamin E in healthy older adults.
Meydani SN, Barklund MP, Liu S, et al.
Community updates
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