The most suitable vitamin D supplement for your children, aged 6 and 10 years, depends on several individual factors, including their diet, sun exposure, growth, overall health, and whether they have a confirmed vitamin D deficiency. Because vitamin D requirements vary by age and health status, and excessive intake can be harmful, it is not possible to recommend a specific supplement or dose without proper evaluation. It is recommended to consult a paediatrician, who can assess your children's nutritional needs and advise on the appropriate vitamin D supplement and dosage if needed. In the meantime, encourage a balanced diet that includes vitamin D-rich or fortified foods, regular safe sunlight exposure, and an active lifestyle to help support healthy bone growth and overall well-being.