Getting sick while pregnant. (2020, June 15). American Pregnancy Association. Retrieved August 11, 2020, from https://americanpregnancy.org/pregnancy-complications/sick-while-pregnant/
Gruenwald, J., Graubaum, H., Busch, R., & Bentley, C. (2006). Safety and tolerance of Ester-C® compared with regular ascorbic acid. Advances in Therapy, 23(1), 171-178. https://doi.org/10.1007/bf02850358
How to prevent illness in pregnancy. (2020, April 6). NHS inform. Retrieved August 11, 2020, from https://www.nhsinform.scot/ready-steady-baby/pregnancy/looking-after-yourself-and-your-baby/how-to-prevent-illness-in-pregnancy
Mor, G., & Cardenas, I. (2010). The immune system in pregnancy: A unique complexity. American Journal of Reproductive Immunology, 63(6), 425-433. https://doi.org/10.1111/j.1600-0897.2010.00836.x
Prietl, B., Treiber, G., Pieber, T. R., & Amrein, K. (2013). Vitamin D and Immune Function. Nutrients, 5(7), 2502-2521. https://dx.doi.org/10.3390%2Fnu5072502
Staying healthy during pregnancy. (n.d.). Nemours KidsHealth. Retrieved August 11, 2020, from https://kidshealth.org/en/parents/preg-health.html
Vitamins, minerals and supplements in pregnancy. (2017, December 21). nhs.uk. Retrieved August 11, 2020, from https://www.nhs.uk/conditions/pregnancy-and-baby/vitamins-minerals-supplements-pregnant/
Almaghamsi, A., Almalki, M. H., & Buhary, B. M. (2018). Hypocalcemia in pregnancy: A clinical review update. Oman Medical Journal, 33(6), 453-462. https://doi.org/10.5001/omj.2018.85