This seems to be based on crappy science. Although studies show that low vitamin D status is linked to poorer cognitive abilities, studies also show that vitami

This seems to be based on crappy science. Although studies show that low vitamin D status is linked to poorer cognitive abilities, studies also show that vitamin D supplementation has no effect whatsoever on cognitive abilities. Most likely it is another factor causing both the lower vitamin D status as well as cognitive decline (such as lack of outdoor exercise).