Vitamin E
A fat-soluble antioxidant vitamin — beneficial at dietary levels, not as a high-dose supplement.
What it is
Vitamin E is a family of fat-soluble antioxidants (tocopherols and tocotrienols) that protect cell membranes. It's found in nuts, seeds, and vegetable oils.
How it works
Vitamin E is a family of fat-soluble antioxidants (tocopherols and tocotrienols) that protect cell membranes from oxidative damage by neutralizing free radicals, and it supports immune function. Alpha-tocopherol is the form the body preferentially uses. It works well at dietary levels; the trouble comes when people take high-dose isolated supplements.
What it's been studied for
Used to support antioxidant defenses and skin health.
What the evidence shows
Vitamin E is essential at normal dietary levels, but large trials of high-dose supplements have not shown protective benefits — and some found potential harm. Food-level intake is the goal, not megadoses.
Who should consider it
At normal dietary levels it's essential for everyone, but most people get enough from food, so routine high-dose supplementing isn't recommended. People with fat-malabsorption conditions can fall short. It appears in antioxidant and skin formulas, and in the AREDS eye formula as part of a combination.
Amounts commonly studied
The daily requirement is about 15 mg (roughly 22 IU natural). High-dose supplements are not advisable.
How to take it
The daily requirement is about 15 mg (roughly 22 IU natural). It's fat-soluble, so take it with a meal. Natural (d-alpha-tocopherol) is better retained than synthetic (dl-), and mixed tocopherols better reflect food. There's little reason to take high-dose isolated vitamin E.
Forms & absorption
Natural (d-alpha-tocopherol) is better retained than synthetic (dl-). Mixed tocopherols better reflect food.
Food sources
Nuts and seeds (almonds, sunflower seeds), vegetable oils (sunflower, safflower), wheat germ, avocado, and leafy greens. A diet with these easily covers needs.
Safety & interactions
High doses can increase bleeding risk, especially with blood thinners, and haven't shown benefit. Keep to sensible amounts.
Myths & what it won't do
Myth: high-dose vitamin E prevents heart disease and cancer. Reality: large trials of high-dose supplements didn't show these benefits, and some found potential harm. Myth: more antioxidant is always better. Reality: past dietary adequacy, extra vitamin E adds no clear benefit and high doses can raise bleeding risk.
Common questions
- Should I take a vitamin E supplement?
- For most people, no — food provides enough, and high-dose supplements haven't shown benefit and may carry risks. It's mainly relevant for diagnosed deficiency.
- Natural or synthetic?
- Natural (d-alpha-tocopherol) is better retained than synthetic (dl-alpha-tocopherol). Mixed tocopherols more closely mirror the forms in food.
- Can it thin the blood?
- High doses can increase bleeding risk, especially with blood thinners or before surgery — another reason to avoid megadoses.
The amounts listed here are what published research has used — not a prescription or a recommended dose for you. Confirm anything you plan to take with your own healthcare provider, especially if you take medications, are pregnant or nursing, or have a health condition.
Related goals
Research on Vitamin E
Recommendations on this page are informed by published research. This is educational information, not medical advice.
- Miller ER 3rd, Pastor-Barriuso R, Dalal D, et al. Meta-analysis: high-dosage vitamin E supplementation may increase all-cause mortality. Ann Intern Med. 2005;142(1):37-46. View study →Note: Pooled trials found high-dose vitamin E (400 IU/day or more) was associated with a small increase in deaths from any cause.