Vitamin E is a group of fat-soluble compounds, with alpha-tocopherol being the most common, that acts as a primary antioxidant protecting cell membranes from lipid peroxidation. While theoretically beneficial for aging by combating oxidative stress, large-scale clinical trials on supplementation have been largely disappointing, failing to show consistent benefits for longevity and in some cases indicating potential harm at high doses.
Verdict
Best obtained from diet; supplementation for longevity is not supported by evidence.
HEALTHSPAN IMPACT
Experimental
RISK LEVEL
Low
EVIDENCE GRADE
A
MONTHLY COST
$5 - $20
Protocol
- The RDA is 15 mg (22.4 IU) daily, typically achieved through diet.
- Supplementation protocols often use 100-400 IU, favoring mixed tocopherols over alpha-tocopherol alone.
Flags
- High-dose supplementation (>400 IU/day) is associated with increased all-cause mortality in some meta-analyses.
- May increase the risk of hemorrhagic stroke, especially at high doses.
- Interacts with anticoagulant/antiplatelet drugs (e.g., warfarin), increasing bleeding risk.
- Supplementation may blunt some of the beneficial adaptive responses to exercise.
- Alpha-tocopherol-only supplements can deplete other important forms of vitamin E, like gamma-tocopherol.