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Summary of key study outcomes.
| Study | Outcome | Vitamin D influence |
|---|---|---|
| Ko et al. (2) | Cumulative live birth rate | Positive correlation with vitamin D levels |
| Piao et al. (8) | Pregnancy rates | Increased with vitamin D supplementation |
| Hu et al. (3) | Granulosa cell proliferation | Enhanced by 25(OH)D3 |
| Dastorani et al. (10) | Metabolic profiles | Improved with vitamin D supplementation |
| Pagliardini et al. (12) | Vitamin D deficiency prevalence | High among infertile women |
