Effectiveness of the national vitamin D supplementation program: evaluation of children aged 0–3 years in Karabük province

Reforms are necessary in the current strategy for vitamin D supplementation, which is provided free of charge before the age of one. To enhance the effectiveness of the program, healthcare providers in primary care settings should play a central role. The new strategy should focus on a thorough explanation and, in particular, the implementation of a control mechanism. Such a mechanism can ensure oversight by encouraging reminders.