Calcium and phosphorus absorption and homeostasis: stimulates intestinal absorption of dietary calcium and phosphorus; regulates serum calcium levels by controlling reabsorption in the kidneys; essential for maintaining mineral balance for bone mineralization and physiological functions.
Bone health and skeletal development: promotes osteoblast differentiation and bone formation; supports mineralization of bone matrix.
Immune system regulation and antimicrobial function: modulates innate and adaptive immune responses; enhances pathogen recognition and destruction by macrophages and dendritic cells; supports production of antimicrobial peptides; reduces excessive inflammatory responses.
Gene expression and cellular differentiation: functions as a steroid hormone; binds vitamin D receptor in cell nuclei to regulate hundreds of genes involved in cell proliferation, differentiation, and apoptosis across multiple tissues.
Cardiovascular health and blood pressure regulation: modulates vascular smooth muscle contraction/relaxation; regulates renin production in kidneys for blood pressure control; supports endothelial function.
Brain development and neurological function: regulates neurotrophic factor production; supports calcium signaling in neurons; involves in dopamine and serotonin pathways.
Muscle function and strength: essential for calcium-mediated muscle contraction; supports myoblast differentiation.
