1. DeLuca HF. Overview of general physiologic features and functions of vitamin D. Am J Clin Nutr. 2004;80:1689S–96S.
2. Bouillon R, Bischoff-Ferrari H, Willett W. Vitamin D and health: perspectives from mice and man. J Bone Miner Res. 2008;23:974–9.
3. Public Health England (PHE). Ultraviolet radiation and vitamin D: the effects on health. 2017. Chapter 5. Available online:
https://www.gov.uk/government/publications/ultraviolet-radiation-and-vitamin-d-the-effectson-health
. Accessed on 5 Feb 2018.
4. Report on health and social subjects 49;Department of Health,1998
5. Food and Nutrition Board, Institute of Medicine. Dietary reference intakes for calcium, magnesium, phosphorus, vitamin D, and fluoride. Washington, DC: National Academy Press; 1997.