Vitamin A for Increased Intestinal Permeability (Leaky Gut)
CRetinoic acid signaling maintains epithelial integrity and IgA production. Supplementation benefits seen primarily in deficient populations.
The Bottom Line
Retinoic acid signaling maintains epithelial integrity and IgA production. Supplementation benefits seen primarily in deficient populations.
Key Study Findings
Population: Community-dwelling elderly individuals
Population: HFD-induced NAFLD mouse model
Population: Vegan athletes (narrative review)
Population: G20 countries population, 1990-2021
Population: Mouse model (APP/PS1)
Population: Chickens
Key Statistics
3
Studies
250
Participants
Positive
Grade
Referenced Papers
Dosage & Usage
mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units
Commonly Used Dosages
- general:
- 700-900 mcg RAE/day (RDA for adults)
- gutbarriersupport:
- 900 mcg RAE/day from mixed sources
- deficiencycorrection:
- 200,000 IU single dose (WHO protocol for severe deficiency, medical supervision)
Upper limit: 3,000 mcg RAE/day (preformed vitamin A; beta-carotene has no established UL)
Dosages Studied in Research
| Dosage | Duration | Effect | N |
|---|---|---|---|
| None | -- | Negative | 54 |
| None | 12 weeks | Positive | -- |
| None | -- | Positive | -- |
| None | -- | Positive | -- |
| None | 12 weeks | Negative | -- |
| None | -- | Positive | -- |
| None | 11 weeks | Positive | -- |
| 10 mg/kg | -- | Negative | -- |
Best taken: With meals containing fat for better absorption
Safety & Side Effects
Reported Side Effects
- ⚠ Hepatotoxicity at chronic high doses of preformed vitamin A
- ⚠ Birth defects (teratogenic at high doses during pregnancy — avoid >3,000 mcg RAE/day)
- ⚠ Nausea, headache, and dizziness
- ⚠ Bone density reduction with long-term excess
Known Interactions
- ● Retinoid medications (isotretinoin, tretinoin — additive toxicity risk)
- ● Orlistat (reduces absorption of fat-soluble vitamins)
- ● Alcohol (increases hepatotoxicity risk of vitamin A)
- ● Tetracycline antibiotics (increased risk of intracranial pressure)
Tolerable upper intake: 3,000 mcg RAE/day (preformed vitamin A; beta-carotene has no established UL)
Always consult your healthcare provider before starting any supplement.
Frequently Asked Questions
Does Vitamin A help with Increased Intestinal Permeability (Leaky Gut)?
How much Vitamin A should I take for Increased Intestinal Permeability (Leaky Gut)?
Are there side effects of Vitamin A?
How strong is the evidence for Vitamin A and Increased Intestinal Permeability (Leaky Gut)?
Related Evidence
Other ingredients for Increased Intestinal Permeability (Leaky Gut)
Vitamin A for other conditions
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.