18 Apr 2019 Blackmores Vitamin D deficiency and cognitive decline 18 Apr 2019 Share Share on LinkedIn Share on Facebook Share on Twitter Share on Google+ Share on Pinterest News With approximately 1 billion people worldwide deficient in vitamin D authors of a new review on its role in cognitive function are calling for more research to be undertaken in this area, particularly in schizophrenia, after links between deficiency and neuropsychiatric illness have been found. × To continue reading this article, please Log In or Sign Up for access.