How does vitamin E protect against oxidation?
Vitamin E protects the fats in cell membranes: it gives up an electron and stops the oxidation chain. It comes mostly from oils, seeds and nuts; the liver keeps the alpha form and body fat stores most of it.
Which foods provide the most vitamin E?
Oils, seeds and nuts. A single tablespoon of wheat germ oil provides 20.3 mg, more than an adult's daily need (15 mg, ODS figures).
| Food | Serving | Vitamin E (alpha) |
|---|---|---|
| Wheat germ oil | 1 tbsp | 20.3 mg |
| Sunflower seeds | 1 oz (28 g), roasted | 7.4 mg |
| Almonds | 1 oz (28 g), roasted | 6.8 mg |
| Sunflower oil | 1 tbsp | 5.6 mg |
| Hazelnuts | 1 oz (28 g), roasted | 4.3 mg |
| Peanut butter | 2 tbsp | 2.9 mg |
| Cooked spinach | ½ cup | 1.9 mg |
| Kiwi | 1 medium | 1.1 mg |
How does it reach the blood?
With the fats from the meal, thanks to bile and pancreatic enzymes. Gut cells put it into chylomicrons, which pass through the lymph. It takes 9 to 12 hours between the meal and arrival in the blood. Then, in the liver, a protein (α-TTP) holds on to the alpha form and puts it back into the blood; the other forms are broken down and eliminated.
Where is it stored?
Mainly in body fat: about 90% of the body's vitamin E is there, according to an old estimate (Traber and Kayden, 1987). A tracer study puts it at 11 ± 3 g in the whole body, with a half-life of about 184 ± 48 days in body fat (Novotny, 2012). This store therefore empties very slowly.
What does vitamin E do?
It is a fat-soluble antioxidant. In cell membranes, it stops the chain reactions that damage fats, and it also protects LDL from oxidation. It has other roles, notably in the immune system.
Page updated on October 30, 2026. Requirements are those of the ODS (United States).
Frequently asked questions
Should you take a vitamin E supplement?
A varied diet is enough for most people, and true deficiency is rare. Trials have not proven that pills prevent cancer or heart disease.
Can vitamin E be dangerous?
In food, no. As a supplement, the limit is 1,000 mg a day for adults. At high doses, the risk of hemorrhagic stroke rises, and it can interfere with the action of vitamin K.
Who is at risk of vitamin E deficiency?
Mainly people who absorb fats poorly: certain diseases of the liver, pancreas or gut, or rare genetic diseases. The deficiency then damages the nerves, muscles and retina.
What is the difference between d-alpha and dl-alpha?
D-alpha-tocopherol is the natural form, dl-alpha-tocopherol the synthetic one. It takes about 1.5 times more of the synthetic form for the same effect (ODS).
Why eat seeds with fat?
They already provide it: seeds, nuts and oils are rich in both vitamin E and fats, which helps absorption.
See also
The route of fats The lymph in motion Vitamin A and vision Vitamin K and clotting
Sources
- NIH Office of Dietary Supplements. Vitamin E, fact sheet for health professionals. ods.od.nih.gov
- Linus Pauling Institute, Oregon State University. Vitamin E. lpi.oregonstate.edu
- Traber MG, Kayden HJ. Tocopherol distribution and intracellular localization in human adipose tissue. Am J Clin Nutr. 1987;46(3):488-95. PMID 3630967
- Novotny JA, Fadel JG, Holstege DM, Furr HC, Clifford AJ. This kinetic, bioavailability, and metabolism study of RRR-α-tocopherol in healthy adults suggests lower intake requirements than previous estimates. J Nutr. 2012;142(12):2105-11. PMID 23077194
True or false?
All forms of vitamin E stay in the body.
False. The liver mainly keeps the alpha form thanks to the protein α-TTP. The other forms are broken down and eliminated (Linus Pauling Institute).
Vitamin E is stored mainly in body fat.
True. About 90% of the body's vitamin E would be there, according to an estimate (Traber and Kayden, 1987).
The more vitamin E pills you take, the better off you are.
False. Trials do not show this benefit, and high doses raise the risk of hemorrhagic stroke (ODS).
Cite this page
To cite this page in a paper, an article or a presentation:
Metabolive. "How does vitamin E protect against oxidation?" Updated November 1, 2026. https://metabolive.com/en/everyday/vitamin-e.