“Insufficient Vitamin D Concentrations in Norwegian Children and Adolescents, Especially Those with Non-Western Immigrant Background: Implications for Higher Recommended Supplements”

https://pubmed.ncbi.nlm.nih.gov/38116881

This study found that vitamin D concentrations are often insufficient in children and adolescents living in Norway, particularly in those with a non-Western immigrant background, suggesting a need for higher recommended supplements.