People with vitiligo have different gut and skin bacteria and metabolites than healthy individuals, and some bacterial molecules may resemble skin pigment proteins, potentially confusing the immune system.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Whether microbiome modulation (probiotics, fecal transplant) alters vitiligo incidence or progression in controlled trials.
A systematic review and meta-analysis of all RCTs testing probiotics, prebiotics, or fecal microbiota transplantation in vitiligo patients, measuring disease activity, serum metabolites, and T-cell reactivity to melanocyte antigens across ≥5 trials with >300 participants.
Whether oral B. fragilis supplementation induces cross-reactive T-cell responses to melanocyte antigens in healthy volunteers.
A double-blind RCT of 60 healthy adults randomized to oral B. fragilis strain (with peptide homology to PMEL/gp100) or placebo for 8 weeks, measuring T-cell reactivity to melanocyte peptides via ELISpot and serum autoantibodies before and after.
Whether microbiome composition and hippuric acid levels predict vitiligo onset in high-risk individuals.
A prospective cohort study following 200 first-degree relatives of vitiligo patients for 3 years, collecting stool and serum samples quarterly to measure microbiome composition and hippuric acid, correlating with development of autoantibodies and clinical vitiligo.
Whether vitiligo patients have higher serum levels of hippuric acid and B. fragilis-specific antibodies than controls.
A case-control study comparing serum hippuric acid, B. fragilis abundance (qPCR), and IgG antibodies against B. fragilis peptides homologous to PMEL/gp100 in 80 vitiligo patients and 80 matched controls.
Whether vitiligo patients have different gut microbiome profiles than healthy individuals.
A cross-sectional analysis of stool microbiome composition via 16S rRNA sequencing in 100 vitiligo patients and 100 healthy controls, matched for age, diet, and geography.