Vitamin D metabolism, functions and needs: from science to health claims

Battault S1, Whiting SJ, Peltier SL, Sadrin S, Gerber G, Maixent JM
Eur J Nutr. 2013 Mar;52(2):429-41. doi: 10.1007/s00394-012-0430-5. Epub 2012 Aug 12

https://www.ncbi.nlm.nih.gov/pubmed/22886046