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6. DC Schöndorf et al. 'The NAD+ Precursor Nicotinamide Riboside Rescues Mitochondrial Defects and Neuronal Loss in iPSC and Fly Models of Parkinson's Disease'. June 5 2018. Cell Reports 23: 2976€“2988. https://www.cell.com/cell-reports/pdf/S2211-1247(18)30742-3.pdf

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12. BMJ Newsroom. 'Calcium supplements may boost risk of abnormal bowel growths (polyps)'. March 2 2018. https://www.bmj.com/company/newsroom/calcium-supplements-may-boost-risk-of-abnormal-bowel-growths-polyps/

13. MC Magnus et al. 'Vitamin D and risk of pregnancy related hypertensive disorders: mendelian randomisation study'. June 20 2018. BMJ 361: k2167. https://www.bmj.com/content/361/bmj.k2167

14. University of Eastern Finland. 'High vitamin D levels linked to lower cholesterol in children'. June 7 2018. http://www.uef.fi/en/news-and-events/-/asset_publisher/O7FHzUMWTBu0/content/id/1930371

15. S Soininen et al. 'Serum 25-hydroxyvitamin D, Plasma Lipids, and Associated Gene Variants in Prepubertal Children'. May 9 2018. J Clin Endocrinol Metab. jc.2018-00335. https://academic.oup.com/jcem/advance-article-abstract/doi/10.1210/jc.2018-00335/4993920?redirectedFrom=fulltext

16. PAGB, CRNUK, HFMA. 'Update on the UK industry maximum level for vitamin D in food supplements for adults'. March 2 2018. https://www.pagb.co.uk/latest-news/mpl-vitd-adults/