Vitamin E: forms, antioxidant role and how the body handles it
What it found
Vitamin E is a group of eight fat-soluble compounds, but human dietary needs are met only by alpha-tocopherol.
The body's handling of these compounds is the focus of ongoing research.
What they found
Eight forms
Vitamin E describes eight fat-soluble compounds: four tocopherols and four tocotrienols, named alpha, beta, gamma and delta.
Antioxidant function
Its best-known job is as a chain-breaking antioxidant that stops the cycle of lipid peroxidation.
Only alpha-tocopherol
Human dietary vitamin E needs are limited to alpha-tocopherol because the body poorly recognises the other forms and does not convert them into alpha-tocopherol.
Liver protein
A liver protein called alpha-TTP preferentially secretes alpha-tocopherol into the blood plasma.
Metabolism and drugs
Vitamin E goes through phase I and phase II metabolism, which may affect how it interacts with drugs.
Bile excretion
ATP-binding cassette proteins regulate how vitamin E is excreted in bile.
What the authors conclude
“It is expected that the continued studies of these regulatory pathways will provide new insights into vitamin E function from which additional human health benefits will evolve.”
Also in their conclusions
- They expect that continued studies of these regulatory pathways will provide new insights into vitamin E function.
- They say these insights will lead to additional human health benefits.
How it was done
The authors wanted to better understand vitamin E's health benefits by looking at the molecular mechanisms that regulate it.
What it can’t tell you
- We summarised it from the abstract only.
- This is a review of molecular mechanisms, not a study in people.
- It cannot show what health effects vitamin E has in the human body.
Who paid
- Funding
- Funded by NIDDK NIH HHS (from the PubMed record).
- Authors work at
- Oregon State University, USA
The paper
- Title
- Vitamin E
- Type
- ReviewThe authors read earlier studies and describe what they found. It isn’t a new study.
- Summarised from
- Abstract only
- Cite
- Mustacich DJ, Bruno RS, Traber MG (2007). Vitamin E. Vitamins and hormones. doi:10.1016/S0083-6729(07)76001-6PubMed 17628169DOI
Summary written 26 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error