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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Vitamin E

What does the research say about Vitamin E?

2 health outcomes synthesised

Pillser's research syntheses cover 2 health outcomes for Vitamin E, both focused on liver enzyme levels in clinical populations. The strongest evidence supports a small beneficial effect on reducing aspartate aminotransferase (AST) levels: 3 of 4 studies reported positive results (moderate evidence strength). Most studies used doses of 298 to 1000 IU/day for about 10 weeks in people with non-alcoholic fatty liver disease or related steatotic liver conditions.

Strongest evidence

  • Reduced Aspartate Aminotransferase (AST) Level (moderate evidence): 3 of 4 studies reported a small beneficial effect, with 2 reaching statistical significance. Effective doses ranged from 298 to 1000 IU/day. The evidence comes entirely from people with NAFLD, MASLD, or MASH/NASH.

Mixed or weaker evidence

  • Reduced Alanine Aminotransferase (ALT) Level (low evidence): All 3 studies reported small-to-moderate benefits, but the highest-quality meta-analysis found a small effect that was not statistically significant when analyzed independently. Publication bias is a concern — null results may be underrepresented.

Effective dose patterns Both outcomes converge on a similar dose range: 298–1000 IU/day. The median study duration was 72 days (roughly 10 weeks), suggesting effects may appear within 2–3 months.

Population insights All available evidence comes from people with liver conditions (NAFLD, MASLD, MASH). No studies have examined healthy individuals or other populations. Whether benefits generalize beyond these groups is unknown.

Notable caveats

  • The evidence base is small (4 studies for AST, 3 for ALT) and preliminary.
  • A 2025 review reported a neutral effect on AST, tempering the overall positive signal.
  • Publication bias may inflate apparent benefits for ALT.
  • Two-thirds of findings were statistically significant, but effect sizes were consistently small.

Frequently asked

  • What is Vitamin E good for according to research?
    Research on Vitamin E has focused on two liver-related outcomes: reducing aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels in people with fatty liver conditions. 3 of 4 studies found small benefits for AST (moderate evidence), and all 3 studies found small-to-moderate benefits for ALT (low evidence). The evidence is preliminary and limited to clinical populations.
  • What dose of Vitamin E is typically used in studies?
    The most-studied dose range is 298 to 1000 IU per day, with a typical study duration of about 10 weeks. Not all studies specified exact doses, but this range appeared consistently across both AST and ALT research syntheses.
  • Who benefits most from Vitamin E?
    All studies were conducted in people with non-alcoholic fatty liver disease (NAFLD), metabolic dysfunction-associated steatotic liver disease (MASLD), or metabolic dysfunction-associated steatohepatitis (MASH/NASH). No research was found in healthy individuals or other populations, so benefits outside these groups are unstudied.
  • Are there caveats or limitations in the research on Vitamin E?
    Yes. The evidence base is small (only 7 total studies across both outcomes) and considered preliminary. For AST, a 2025 review reported a neutral effect, weakening the overall positive signal. For ALT, the highest-quality meta-analysis found a non-significant effect, and publication bias may overrepresent positive findings. All evidence comes from clinical populations, so generalizability is limited.
  • Does Vitamin E help reduce AST levels?
    Research suggests a small benefit: 3 of 4 studies reported reduced AST levels with Vitamin E, but one recent review (2025) found a neutral effect. The evidence strength is moderate, and the benefit was observed in people with liver conditions at doses of 298–1000 IU/day for about 10 weeks.

Most-studied combinations with Vitamin E

most supplement research is combination research
Also studied with:L-Glutamine (4), N-Acetyl Cysteine (4), Acetyl-Carnitine (2), L-Carnitine (3), Quercetin (2), Zinc (5), Selenium (2), Magnesium (2), Vitamin A (3), Vitamin D (6), Vitamin C (11), Chamomile (2)
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