References:
[1] Lexicomp®. Vitamin D2 (ergocalciferol): Drug Information [Internet]. Waltham (MA): Uptodate; 2019 [cited 2020 Mar 7]. Available from: http://www.uptodate.com
[2] Lexicomp®. Vitamin D3 (cholecalciferol): Drug Information [Internet]. Waltham (MA): Uptodate; 2019 [cited 2020 Mar 7]. Available from: http://www.uptodate.com
[3] Gonzalez C. Vitamin D Supplementation: An Update. US Pharm. 2010; 35(10): 58-76.
[4] Tripkovic L, Lambert H, Hart K, Smith CP, Bucca G, Penson S, et al. Comparison of vitamin D2 and vitamin D3 supplementation in raising serum 25-hydroxyvitamin D status: a systematic review and meta-analysis. Am J Clin Nutr. 2012; 95(6): 1357-64.
[5] Alshahrani F, Aljohani N. Vitamin D: deficiency, sufficiency and toxicity. Nutrients. 2013; 5(9): 3605-16.