In Parts One and Two of this mini-series on the importance of vitamin D, we have explored two major problems: Vitamin D deficiency is at epidemic levels, with up to 60% of Caucasians being deficient and an even higher proportion of folk who naturally have darker skin colouring such as Hispanic and Afro-Caribbean. Deficiency occurs due to lack of exposure to the sun, overuse of sunblock, lack of intake through diet (especially and inability to use the nutrients due to digestive function being compromised by gluten, H pylori, parasites and yeast and fungal overgrowth). Vitamin D deficiency may lead...