Subcutaneous administration of granulocyte colony-stimulating factor (G-CSF) helped improve endometrial thickness and pregnancy rates in patients with thin endometrium undergoing ART cycles. In a study of 107 patients, those who received subcutaneous G-CSF (Group 1) in addition to sildenafil and aspirin had a significantly higher pregnancy rate of 59% compared to 27% for those who only received sildenafil and aspirin (Group 2). G-CSF works by increasing endometrial decidualization and proliferation. The study provides initial evidence that subcutaneous G-CSF may have a promising role in improving fertility outcomes for thin endometrium cases. Larger studies are still