Alpha-tocopherol supplements and their effect on gamma-tocopherol levels
What it found
Taking extra alpha-tocopherol in supplements lowers the amount of gamma-tocopherol found in blood.
Scientists have recently worked out how this happens.
What they found
Studies in people
Lower gamma-tocopherol levels
Taking too much alpha-tocopherol as a supplement drops the amount of gamma-tocopherol in the blood. Researchers have recently figured out the chemical reason for this change.
Studies in people and animals
Gamma-tocopherol benefits
Gamma-tocopherol may help fight inflammation. It might also protect against clogged arteries and cancer.
Other findings
Different vitamin E sources
Supplements contain only alpha-tocopherol. The main type of vitamin E eaten by people in the United States is gamma-tocopherol instead.
What the authors conclude
- They explain that taking extra alpha-tocopherol through supplements lowers gamma-tocopherol levels in the blood.
- The authors note that scientists have recently worked out the chemical process behind this drop.
- They say understanding this effect matters for human nutrition.
How it was done
Gamma-tocopherol is the main type of vitamin E Americans eat, while supplements only contain alpha-tocopherol. Researchers wanted to understand why taking extra alpha-tocopherol reduces gamma-tocopherol levels in the body.
What it can’t tell you
- We summarised it from the abstract only.
- This work explains a chemical process but does not measure whether lower gamma-tocopherol causes health problems in people.
Who paid
- Authors work at
- University of California, USA
The paper
- Title
- How an increased intake of alpha-tocopherol can suppress the bioavailability of gamma-tocopherol
- Type
- ReviewThe authors read earlier studies and describe what they found. It isn’t a new study.
- Evidence
- Studies in people · animals · lab
- Summarised from
- Abstract only
- Cite
- Wolf G (2006). How an increased intake of alpha-tocopherol can suppress the bioavailability of gamma-tocopherol. Nutrition reviews. doi:10.1111/j.1753-4887.2006.tb00213.xPubMed 16808116DOI
Summary written 1 Oct 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error