Vitamin D – In the News
Muscles starve in the absence of vitamin D, study of mice finds
Without vitamin D, muscles continued to make glycogen, but could not convert it to glucose.
Research continues to link vitamin D levels with better COVID outcomes
Research continues to link vitamin D levels with better COVID outcomes Is there a linear relationship between vitamin D levels and COVID mortality? New and compelling clinical research further cements the case, and even suggests a baseline level of vitamin D at which there’s theoretically zero mortality from the pandemic disease.
The COVID-19 and Vitamin D Education Center
The COVID-19 and Vitamin D Education Center: Connect with expert information and resources
Vegans, This Is What You Need To Look Out For In Your Vitamin D Supplement
How to know if your vitamin D supplement is vegan? The average vitamin D3 supplement (or cholecalciferol) is made from lanolin, a yellow fat that comes from sheep's wool that is UV irradiated to create a concentrated cholecalciferol source. "Nothing wrong with lanolin," says Ferira. "It's a fine D3 source." It doesn't pose any significant safety concerns, per the Environmental Working Group (EWG), but it does come from sheep's wool, which is, ahem, not vegan.
The Impact of Vitamin D Level on COVID-19 Infection: Systematic Review and Meta-Analysis
The qualitative synthesis indicated that vitamin D deficient individuals were at higher risk of COVID-19 infection as compared to vitamin D sufficient patients.
Technical Publications
Why D3 is preferred over D2?
Vitamin D3 seems more appropriate than D2 to sustain adequate levels of 25OHD: a pharmacokinetic approach
B Oliveri, S R Mastaglia, G M Brito, M Seijo, G A Keller, J Somoza, R A Diez, G Di Girolamo, Eur J Clin Nutr. 2015 Jun;69(6):697-702. doi: 10.1038/ejcn.2015.16. Epub 2015 Mar 18.
Effects of vitamin D2-fortified bread v. supplementation with vitamin D2 or D3 on serum 25-hydroxyvitamin D metabolites: an 8-week randomised-controlled trial in young adult Finnish women
Suvi T Itkonen, Essi Skaffari, Pilvi Saaristo, Elisa M Saarnio, Maijaliisa Erkkola, Jette Jakobsen, Kevin D Cashman, Christel Lamberg-Allardt, Br J Nutr. 2016 Apr 14;115(7):1232-9. doi: 10.1017/S0007114516000192. Epub 2016 Feb 11.
Effects of High-Dose Vitamin D2 Versus D3 on Total and Free 25-Hydroxyvitamin D and Markers of Calcium Balance
Albert Shieh,corresponding author Rene F. Chun, Christina Ma, Sten Witzel, Briana Meyer, Brandon Rafison, Leon Swinkels, Tonnie Huijs, Sam Pepkowitz, Brett Holmquist, Martin Hewison, and John S. Adams, J Clin Endocrinol Metab. 2016 Aug; 101(8): 3070–3078. Published online 2016 May 18. doi: 10.1210/jc.2016-1871
Vitamin D2 Is Much Less Effective than Vitamin D3 in Humans
LAURA A. G. ARMAS, BRUCE W. HOLLIS, AND ROBERT P. HEANEY, The Journal of Clinical Endocrinology & Metabolism, Volume 89, Issue 11, 1 November 2004, Pages 5387–5391
The case against ergocalciferol (vitamin D2) as a vitamin supplement
Lisa A Houghton and Reinhold Vieth, Am J Clin Nutr 2006;84:694 –7