CCL2 and type 1 diabetes mellitus: Additionally, Gabbay et al. [57] reported that cholecalciferol supplementation (2000 IU/day for 18 months) resulted in increased monocyte chemoattractant protein-1 (MCP-1) levels, a higher percentage of regulatory T cells (Tregs), and lower cumulative incidence of progression to undetectable (≤0.1 ng/mL) fasting and stimulated serum C-peptide in patients with new-onset T1DM.