Vitamin E
Pronunciation: pronunciation varies by local usage.
- Generic name
- alpha-tocopherol
- Drug class
- Essential fat-soluble vitamin (antioxidant)
- Form
- Not specified — available as various dietary supplement formulations
- Route
- Oral
- Legal status
- Available without a prescription as a dietary supplement; also naturally occurring in food
Availability and supply rules vary by country
Trade names by country: United States
Australia: · Full directory
What alpha-tocopherol is and how it works
Vitamin E (alpha-tocopherol) is an essential fat-soluble vitamin that functions primarily as an antioxidant, scavenging free radicals to protect cell membranes from oxidative damage. It also supports immune function, red blood cell formation, and cell-to-cell communication, and helps widen blood vessels to help prevent blood clotting inside vessels. (1) (2) (3)
For most healthy people, dietary intake from vegetable oils, nuts, seeds, and leafy greens is sufficient. Overt deficiency is rare outside specific medical conditions. High-dose supplementation carries a recognised bleeding risk and is not routinely recommended for people who are not deficient.
Mechanism of action: how alpha-tocopherol works
Alpha-tocopherol acts primarily as a scavenger of free radicals, protecting cell membranes from oxidative damage. It also inhibits platelet aggregation and monocyte adhesion, supports immune function, and helps the body use vitamin K. (1) (2) (3)
What alpha-tocopherol is used for
Treatment of vitamin E deficiency
Vitamin E supplementation is indicated for deficiency states caused by fat malabsorption disorders (such as cystic fibrosis, chronic pancreatitis, cholestasis, or Crohn disease) or genetic conditions including ataxia with vitamin E deficiency (AVED) and abetalipoproteinemia. Overt deficiency causes a peripheral neuropathy that can progress to spinocerebellar ataxia, skeletal myopathy, and pigmented retinopathy. (1) (2)
Hemolytic anaemia in premature infants
Low vitamin E intake may lead to haemolytic anaemia in premature infants. (3)
Before taking alpha-tocopherol
Do not take / not appropriate for
- Do not take vitamin E if you have a known allergy to vitamin E or components of the specific formulation. (all products) (2)
Tell your clinician about
- Any planned surgery, because of vitamin E's antiplatelet effect and associated bleeding risk.
- Use of any medication that affects bleeding, including anticoagulant or antiplatelet agents — a class-level bleeding-risk warning applies.
- Any fat malabsorption disorder, genetic condition affecting vitamin E transport, or history of peripheral neuropathy.
- Pregnancy, plans for pregnancy, or breastfeeding — no pregnancy-specific or lactation-specific intake figures were established from the sources reviewed, so individual assessment is needed.
How to take alpha-tocopherol
- The Recommended Dietary Allowance (RDA) for adults 19 years and older is 15 mg (35 micromol)/day of alpha-tocopherol from all sources.
- Dietary intake from vegetable oils, nuts, seeds, and leafy green vegetables is the preferred source for healthy individuals; routine supplementation is not recommended for people who are not deficient.
- Do not take high-dose supplements unless a clinician has confirmed a deficiency or specific medical indication and advised a specific dose.
Procedures and treatment changes
Tell the treating team before surgery, procedures, or any medicine change. Do not alter treatment without the responsible clinician. (1) (2) (3)
Missed dose
No specific missed-dose guidance was established in the sources reviewed for this article. Follow the product label or ask the treating clinician for guidance.
Overdose
High supplemental intakes increase the tendency to bleed, including a risk of haemorrhagic stroke. No specific overdose action threshold or emergency-management protocol was established from the sources reviewed beyond this general bleeding-risk awareness; if you have concerns after an unintentional high intake, this is a reason to seek medical attention. (1) (2) (3)
Side effects
High supplemental doses of vitamin E carry recognised risks, particularly related to bleeding tendency.
Gastrointestinal upset, nausea, headache, or visual changes
What to notice: These effects have been reported with vitamin E supplementation.
What to do: Tell the treating clinician if symptoms are persistent or troublesome. (2)
Bleeding or unusual bruising
What to notice: Specific symptom detail was not established in the sources reviewed for this article; the sources support monitoring for abnormal bleeding or bruising generally.
What to do: Contact the treating clinician promptly for assessment. (2) (3)
Serious warnings
Haemorrhagic stroke or serious bleeding — emergency
Symptoms: Specific symptom detail was not established in the sources reviewed for this article; the sources support a general association between high supplemental intakes and bleeding in the brain (haemorrhagic stroke).
Action: Seek emergency medical attention immediately. High supplemental intakes of vitamin E are associated with increased risk of bleeding in the brain. (1) (2) (3)
Interactions
| Medicine or test | Effect | Action |
|---|---|---|
| Anticoagulant and antiplatelet medicines (general class) | Vitamin E inhibits platelet aggregation and increases bleeding risk when combined with agents that affect coagulation or platelet function. The sources reviewed identify a class-level concern without naming specific drugs, mechanisms, or dose thresholds. | Tell the prescriber or pharmacist about all such medicines before starting vitamin E supplementation. (2) |
| Medicines that affect hepatic CYP450 enzymes (enzyme inhibitors or inducers) | Vitamin E undergoes hepatic CYP450 metabolism; monitoring is warranted with enzyme-inhibiting or enzyme-inducing medications, though specific drug names and mechanisms were not detailed in the sources reviewed. | Discuss all current medicines with the treating clinician. (2) |
| Vitamin K utilisation | Vitamin E helps the body use vitamin K. The clinical significance of this interaction for people on vitamin K antagonists is not detailed in the sources reviewed beyond the general bleeding-risk caution. | Ensure the treating clinician is aware of the full supplement and medicine list. (3) |
Pregnancy, breastfeeding, kidney/liver function, age
Children and adolescents
RDA/AI figures from the source reviewed: ages 1–3 years — 6 mg/day; ages 4–8 years — 7 mg/day; ages 9–13 years — 11 mg/day; ages 14–18 years — 15 mg/day. Infants: Adequate Intake is 4 mg/day (0–6 months) and 5 mg/day (7–12 months). Deficiency-treatment doses for paediatric patients (1 month–12 years) have been described as 1 unit/kg/day with age-specific maximums (no unified mg conversion established from the sources reviewed). Do not extrapolate adult high-dose regimens to a child. (1) (2)
Pregnancy and breastfeeding
No pregnancy-specific or lactation-specific RDA/AI figures were found in the sources reviewed. One source notes elevated vitamin E levels may be associated with increased birth-defect risk, though this 'requires further research' and is not established as a definitive causal claim. Discuss any supplementation with the maternity-care clinician. (3)
People undergoing surgery
Because vitamin E inhibits platelet aggregation, bleeding precautions are warranted around surgery. Tell the surgical team about all supplement use. (2)
People with fat malabsorption or genetic transport defects
These conditions are the primary reasons deficiency occurs. Diagnosis and supervised supplementation require specialist assessment; serum alpha-tocopherol monitoring requires adjustment for serum lipid/protein levels. (1) (2)
Monitoring
Before starting
- Confirm whether a deficiency state, fat malabsorption disorder, or genetic condition exists that warrants supplementation.
- Assess dietary intake, bleeding history, current medicines (especially any anticoagulant or antiplatelet agent), and planned surgery.
During treatment
- For at-risk populations, serum alpha-tocopherol level may be monitored (normal >0.5 mg/dL), with values requiring adjustment for serum lipid/protein levels.
- Watch for signs of abnormal bleeding or bruising, especially at high supplemental intakes.
Storage
No storage information was established in the sources reviewed for this article. Follow the specific product label instructions.
Professional information
Clinician-facing context only. Use current local guidance and the specific product information.
United States (NCBI DRI chapter)
Indication: General population intake recommendations
Dose summary: Adult RDA: 15 mg (35 micromol)/day alpha-tocopherol. Tolerable Upper Intake Level (UL) for adults: 1,000 mg (2,325 micromol)/day of any form of supplemental alpha-tocopherol. Paediatric RDA/AI values as detailed in the children special-population section.
Renal context: No renal-impairment-specific dosing was established from the sources reviewed. (1)
StatPearls (unit-based figures, not mg)
Indication: Deficiency treatment
Dose summary: Adults: 60–75 units daily (maximum 1,000 units). Cystic fibrosis: 100–400 units daily. Paediatric (1 month–12 years): 1 unit/kg/day with age-specific maximums (200–800 units). Tardive dyskinesia (off-label): 1,600 units daily. Upper safe limits cited: 1,500–2,200 units for adults; 200–800 units for children by age band. Note: the unit-based figures in this source are not numerically reconciled with the mg-based UL of 1,000 mg/day in the NCBI DRI chapter; both are presented as reported by their respective sources.
Renal context: No renal-impairment-specific dosing was established from the sources reviewed. (2)
Hepatic guidance
Vitamin E undergoes hepatic CYP450 metabolism. No impairment-specific dose adjustment was established from the sources reviewed; individual assessment is needed.
Overdose note
Hypervitaminosis E is rare. Recognised risks at high supplemental intakes include increased bleeding tendency (including haemorrhagic stroke), decreased absorption of other fat-soluble vitamins, impaired bone mineralisation, and coagulopathies. No specific emergency-management protocol beyond general bleeding-risk awareness was established from the sources reviewed. (1) (2) (3)
Frequently asked questions
Can I get enough vitamin E from food alone?
For most healthy people, yes. Vegetable oils, nuts, seeds, and leafy green vegetables are rich dietary sources. Overt deficiency from low dietary intake alone in otherwise healthy people is extremely rare. (1) (3)
Is high-dose vitamin E safe?
High supplemental intakes are associated with an increased tendency to bleed, including a risk of haemorrhagic stroke. One source reports that one clinical trial found 50% higher mortality from haemorrhagic stroke among participants taking high-dose supplements. Do not take high doses unless a clinician has confirmed a specific medical need and advised a dose. (1) (2) (3)
Does vitamin E prevent heart disease?
Studies of vitamin E for prevention of cardiovascular disease have not proven beneficial, according to the sources reviewed. (2)
References
- Dietary Reference Intakes for Vitamin C, Vitamin E, Selenium, and Carotenoids — Vitamin E chapterNational Center for Biotechnology Information (NCBI), U.S. National Library of Medicine · United States · accessed 2026-08-05 · source 1
- Vitamin EStatPearls Publishing · United States · accessed 2026-08-05 · source 2
- Vitamin EMedlinePlus, U.S. National Library of Medicine · United States · accessed 2026-08-05 · source 3
Brand names by country
Single-ingredient alpha-tocopherol names are shown separately by country. Product availability, strengths, and supply rules can change; combination products are not included here.
Priority countries
United States
- Ortho Molecular ProductsOrtho Molecular Products
- CellucorCellucor
- Alpha LionAlpha Lion
- NOWNOW
- Sundown NaturalsSundown Naturals
- Wonder LaboratoriesWonder Laboratories
- Higher NatureHigher Nature
- ProCaps LaboratoriesProCaps Laboratories
- Life ExtensionLife Extension
- Nature's BountyNature's Bounty