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Vitamin D Tied to Immune Shifts in IBD, Mayo-Led Study Finds

The small, non-randomized study offers early biomarker evidence that warrants controlled testing.

Gubatan et al. demonstrate that vitamin D promotes immune tolerance to gut microbiota in patients with inflammatory bowel disease. Image credit: Gubatan et al., doi: 10.1016/j.xcrm.2026.102703.

Overview

  • The Mayo Clinic team published the 12-week, before-and-after study Thursday in Cell Reports Medicine.
  • Researchers gave weekly vitamin D to 48 people with Crohn’s disease or ulcerative colitis who had low levels, then analyzed blood and stool with advanced sequencing tests.
  • Supplementation was linked to higher IgA and lower IgG against gut microbes, with more activity in regulatory immune cells that help dial down inflammation.
  • Disease activity scores and a stool marker of gut inflammation improved after treatment, though the single-arm design cannot show cause and effect.
  • Authors urged patients to seek medical guidance on dosing and called for larger randomized trials to test benefit and safety.