FOXP3 and Allergy: Clostridium butyricum CGMCC0313 increases forkhead box P3 (FOXP3) Treg cells, TGF-β, and IL10, inverts the imbalance between Th1/Th2 and Th17/Treg cells, and reduces β-lactoglobulin-mediated intestinal anaphylaxis, thereby contributing to the reduction of the risk of allergy in mice (309).