serum 25−hydroxyvitamin D significantly increased in the intervention group vs. the control. Total body fat decreased in the intervention group. while visceral fat was significantly different between the groups. Adiponectin, calcium, phosphors, and PTH levels increased, while liver enzymes, insulin, and HOMA−IR decreased in both. There were significant differences in mean changes of serum 25(OH) D, PTH, ALT, AST, ALP, and FBS between the groups after adjusting for baseline, TF and VF. Vitamin D injection did improve NAFLD severity. Here, PTH is linked to metabolic dysfunction-associated steatotic liver disease.