References:

¹ NHS – Vitamin B12 and Folate Deficiency

² Harvard Health – Vitamin B12 Deficiency Can Be Sneaky and Harmful

³ Viva! – The Truth About B12 and Vegan Diets

⁴ Holick MF. (2004). Sunlight and vitamin D for bone health and prevention of autoimmune diseases, cancers, and cardiovascular disease. Am J Clin Nutr, 80(6 Suppl):1678S–1688S.

⁶ Allen LH. Causes of vitamin B12 and folate deficiency. Food Nutr Bull. 2008;29(2 Suppl):S20-34.

⁶ Tucker KL et al. Vitamin B12 status and intake among older adults: Framingham Offspring Study. Am J Clin Nutr. 2000;71(2):514–522.

⁷ Holick MF. Vitamin D deficiency. N Engl J Med. 2007;357(3):266–281.

⁷ Nair R, Maseeh A. Vitamin D: The “sunshine” vitamin. J Pharmacol Pharmacother. 2012;3(2):118–126.