Vitamin D3 Liquid Drops 1000 IU - Pure Vitamin D Liquid in Olive Oil for Children and Adults by Healthmarque (500 doses) : Amazon.co.uk: Health & Personal Care
Low vitamin D status: who is at risk? | Research
Vitamin D | Dietary Reference Intakes: The Essential Guide to Nutrient Requirements | The National Academies Press
Vitamine D | Biologisch Medisch Centrum Utrecht Epe