Health Reference LibraryHow much vitamin E should I take, and is 400 IU too much?
This entry is part of the Nutri Tailor Health Reference Library — cited research on supplements, nutrients and adjacent areas of health.
Summary
Almost nobody needs a vitamin E supplement: a handful of almonds or sunflower seeds covers the safe intake of 4 mg a day for men and 3 mg for women. The 400 IU capsule is a pharmacological dose from the older heart trials, which found no benefit, and the large prostate trial found a small increase in prostate cancer at that dose. If you take vitamin E, 100 to 200 IU of natural d alpha tocopherol, or a mixed tocopherol and tocotrienol product, is the honest range, and 400 IU is a defined course. The NHS says 540 mg (800 IU) a day is unlikely to cause harm; high doses thin the blood and should stop before surgery.
Dose calculator: capsules to reach your vitamin E target
Enter the daily amount of vitamin E you are aiming for and see how many servings of each Nutri Tailor product reach it. Nothing you enter leaves this device. No AI is used.
This tool does arithmetic on the label figures. It is not personal dosing advice and it knows nothing about your history or blood results. The reference intake, the safe upper guide and the trial doses are on this page; talk to your GP or a registered nutritional therapist before changing what you take.
Effective dose
The reference intake is no UK reference intake; a safe intake is 4 mg a day for men and 3 mg for women, which nuts, seeds and vegetable oils supply. Most people need none: a handful of almonds or sunflower seeds covers the safe intake. The 400 IU (268 mg) capsule is a pharmacological dose from the older heart trials, which found no benefit for heart disease and, in the large prostate trial, a small increase in prostate cancer at 400 IU a day. If you take vitamin E, 100 to 200 IU of natural d alpha tocopherol or a mixed tocopherol and tocotrienol product is the honest range, and 400 IU is a defined course, not a habit.
Safety profile
How much is too much: the NHS says 540 mg (800 IU) or less a day from supplements is unlikely to cause harm. High dose vitamin E thins the blood, so it should stop before surgery and needs a GP conversation for anyone with a bleeding tendency. Above 800 IU a day the risk of bleeding rises. Because it is fat soluble it accumulates, and the meta analyses of long term high dose trials found no benefit and a possible increase in mortality above 400 IU.
Guideline positions
NHS vitamins and minerals guidance for vitamin E. NIH Office of Dietary Supplements fact sheet for vitamin E where one exists. The trial doses quoted above are from the sources listed on this page.
Practical framework
Capsules to reach the dose, from the Nutri Tailor range, all made in the UK: vitamin E 400 IU softgels, 400 IU (268 mg) of natural d alpha tocopherol in wheatgerm oil, for a defined course rather than daily long term use; tocotrienols 125 mg softgels, 125 mg of annatto tocotrienols with no alpha tocopherol, for people who want the other half of the vitamin E family. To read your own result against the UK ranges, use the free blood test result interpreter. This is a summary of published research, not personal health advice. Talk to your GP or a registered nutritional therapist before changing what you take, especially if you are pregnant, have a diagnosed condition or are under ongoing care.
Common misconceptions
That more vitamin E works faster: above the doses the trials used there is no extra effect, only more side effects. That the front of the bottle states the dose: read the per capsule figure and the serving size on the back. That the NHS figure is a toxic threshold: it is the level below which harm is unlikely, which is a different thing.
Sources
- NHS (UK government) 2025. Vitamins and minerals: others (zinc section). NHS.uk.
- NIH Office of Dietary Supplements 2025. Vitamin E Fact Sheet for Health Professionals. NIH ODS.