2.4. Interventions
Participants in the control group received standard prenatal multivitamin supplement tablets, “Obimin”, which contained 400 IU of vitamin D3, along with folic acid, vitamin B1, B2, B6, B12, and other minerals. Participants in the intervention group were additionally provided with an oral-dissolving vitamin-D3-only supplement, contributing an extra 400 IU, alongside the multivitamin tablet (Obimin). Participants in the control group received 400 IU of vitamin D3 daily, while those in the intervention group received 800 IU of vitamin D3 daily. The supplementation was continued from the baseline visit until delivery without any dosage alterations midway through the study. Staff monitored compliance through tablet counts. Participants were advised to maintain their levels of physical activity and dietary intake, and refrain from taking any other supplements containing vitamin D throughout the study period.