Vitamin D supplementation may help rebalance gut immunity in IBD
Key takeaways
- A study has found that vitamin D supplementation in IBD patients increased protective IgA levels and reduced inflammatory IgG, suggesting a shift toward a more balanced immune response.
- The study found vitamin D positively influenced beneficial gut bacteria while reducing harmful strains linked to inflammation.
- Researchers highlight promising results but stress the need for larger, controlled trials before clinical recommendations can be made.
Vitamin D supplementation may influence how the immune system responds to gut bacteria in people suffering from inflammatory bowel disease (IBD), according to a study.
IBD affects millions of people globally, and the study authors say the findings provide new insights into how the gut microbiome and immune system interact in this chronic condition. The disease includes Crohn’s disease and ulcerative colitis, and is partly driven by the immune system’s reaction to bacteria.
“This study suggests vitamin D may help rebalance how the immune system sees gut bacteria,” says lead author John Mark Gubatan, M.D., a gastroenterologist at Mayo Clinic in Florida, US. “That’s an important step toward understanding how we might restore immune tolerance in IBD.”
Boosting the immune system
The study included 48 IBD participants with low levels of vitamin D. They received vitamin D supplements for 12 weeks, and left blood and stool samples before and after the trial began. These samples were analyzed for sequencing to map interactions between immune responses and the gut microbiome.
The researchers found that vitamin D supplementation increased IgA levels while decreasing IgG levels.The research team found that vitamin D supplementation increased immunoglobulin A (IgA) levels — a biomarker associated with protective immune responses — while decreasing immunoglobulin G (IgG) levels — associated with inflammation.
Vitamin D influenced the beneficial bacteria Lachnospiraceae and Blautia, which are bound to IgA, while decreasing Proteobacteria and Enterococcaceae, which are bound to IgG.
The findings have been published in Cell Reports Magazine and suggest supplementing with vitamin D may boost a more protective and balanced immune response to gut bacteria.
“We saw encouraging signals, but this was not a randomized trial,” says Gubatan. “These findings need to be confirmed in larger, controlled studies.”
The team emphasizes that people should not change their vitamin D dose without first consulting with a medical professional, as dosages need to be personalized.
Multibeneficial vitamin
Vitamin D3 has recently been found to reduce the risk of developing long COVID symptoms weeks after infection. Although the supplement did not decrease the severity of infections or reduce the number of hospital visits, it may have a connection to long COVID outcomes.
Another review and meta-analysis revealed that vitamin D2 supplements may lower vitamin D3 levels, which are essential for bone and immune health. The study suggested prioritizing vitamin D3 supplements, especially if suffering from a vitamin D deficiency.
Apart from immune health, vitamin D supplementation has also been highlighted for its healthy aging benefits and cardiovascular health.
