Also known as: Tocopherol, d-alpha-tocopherol, dl-alpha-tocopherol, Tocotrienols, Mixed tocopherols
VitaminsStrong evidence
A fat-soluble antioxidant protecting cell membranes from oxidative damage. The natural and synthetic forms differ substantially in potency, and the label tells you which you are getting if you know what to look for.
Typical dose
15.0–50.0 mg per day
With a fat-containing meal; away from training if training for adaptation
What it is
Vitamin E is not one compound but eight related ones: four tocopherols and four tocotrienols. Alpha-tocopherol is the form the body preferentially retains and the one reference intakes are based on.
Sources include vegetable oils, nuts, seeds, wheat germ and avocado. Sunflower seeds and almonds are particularly rich.
Here is the label detail worth knowing: d-alpha-tocopherol is the natural form. dl-alpha-tocopherol is synthetic and roughly half as potent, because only some of what it contains is the form the body uses. A single letter distinguishes them and the price difference reflects it. Mixed tocopherol products supply the fuller range found in food.
How it works
Vitamin E sits within cell membranes and intercepts the chain reaction of lipid peroxidation, in which one damaged fat molecule damages the next. By donating a hydrogen atom it halts that chain.
Having done so, vitamin E is itself oxidised and must be regenerated, a job performed largely by vitamin C. This is one of the clearer examples of antioxidants working as a system rather than individually.
It also has effects on cell signalling and on platelet aggregation that are separate from its antioxidant role, and the latter is the basis of its main safety consideration.
What the evidence shows
Vitamin E's essentiality is established, though genuinely low status is rare in people eating ordinary diets, since it is widespread in fats and oils.
Large trials of high-dose vitamin E supplementation for long-term health outcomes have been consistently disappointing, and some have raised concerns rather than showing benefit. This is one of the clearest examples of the pattern that runs through this whole index: isolating an antioxidant at high doses does not reproduce the benefits of eating food that contains it.
For athletes specifically, high-dose vitamin E taken around training has been shown to blunt some of the adaptations exercise produces, since the oxidative stress of training is part of the signal that drives adaptation. That is a reason to be cautious rather than generous with it.
Dosing
Reference intake is around 15 mg daily of alpha-tocopherol, comfortably supplied by a diet containing nuts, seeds and vegetable oils.
If supplementing, choose d-alpha-tocopherol or mixed tocopherols over dl-alpha-tocopherol — the synthetic form is roughly half as potent, and the extra cost of the natural form is genuinely justified rather than marketing.
Modest doses are sensible. The tolerable upper intake is 300 mg daily in European assessment, and high-dose products supplying several hundred milligrams have no established benefit. If you train for adaptation, avoid taking large doses around your sessions. Take with a fat-containing meal.
With a fat-containing meal; away from training if training for adaptation
Competition status
Permitted — not on the WADA Prohibited List
Category
Vitamins
Safety and side effects
At intakes from food and modest supplements, vitamin E is safe and well tolerated.
The main concern at high doses is bleeding. Vitamin E affects platelet function and interferes with vitamin K activity, and high-dose supplementation can increase bleeding tendency. This matters particularly for anyone taking anything that affects blood clotting.
Stop high-dose vitamin E well before any surgery. Speak to your doctor before use if you take regular medication, and check your total intake across multivitamins and combination products.
Who should avoid it
Speak to your doctor before use if you take anything affecting blood clotting, since high-dose vitamin E increases bleeding tendency. Stop high doses at least two weeks before surgery. Do not exceed 300 mg daily. Check your total across multivitamins. Avoid large doses around training sessions if training for adaptation.
This entry is provided for information only. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Consult a qualified healthcare professional before use if you are pregnant, breastfeeding, taking medication or under medical supervision.
