Effects of vitamin D supplementation on metabolic factors, serum omentin-1, and anthropometric indices in middle-aged women with prediabetes: a double-blind randomized controlled trial

The findings revealed that vitamin D administration improved insulin secretion but failed to affect FBS, lipid profiles, anthropometric indices, and body composition in women with prediabetes. Due to inconsistent results, more well-designed RCTs are required to clarify the effects of vitamin D supplementation on these patients.