Evidence Level
Vitamin E exhibits a complex risk-benefit profile influenced by dosage and context. High-dose supplementation (≥400 IU/day) has been associated with increased mortality, as shown in a meta-analysis of 19 trials involving over 135,000 participants (Miller et al., 2005). This finding was corroborated by the SELECT trial, which reported a 17% increase in prostate cancer risk among men taking 400 IU/day of vitamin E (Klein et al., 2011).
Lower doses have demonstrated potential benefits. For example, Meydani et al. (1997) found that 200 mg/day improved immune function in elderly individuals. More recently, Dysken et al. (2014) reported that 2,000 IU/day delayed functional decline in Alzheimer's disease patients.
Emerging evidence highlights additional benefits of vitamin E. Qi et al. (2024) found that vitamin E significantly reduced systolic blood pressure compared to placebo in adults with essential hypertension. Chee et al. (2024) demonstrated that vitamin E improved liver inflammation markers and histology in metabolic dysfunction-associated steatotic liver disease patients. Conversely, de Lima et al. (2024) concluded that vitamin E supplementation had no significant effects on oxidative stress or muscle recovery post-exercise.
Current guidelines generally recommend obtaining vitamin E from dietary sources rather than supplements, except for specific clinical indications.