Vitamin D Vitamin D response elements Regulatory T cells, effector T cells, dendritic cells, adipocytes, mast cells Possibly shifts the T cell balance in favour of regulatory T cells rather than Th9 and Th17; might inhibit Vγ9Vδ2 T cells and adipocyte release of CCL2, and stabilise mast cells Appropriate dosage for use as an immunomodulant is not defined; potential toxicity linked to hypercalcaemia