Being deficient or insufficient in vitamin D can increase dementia risk by 80%. The converse is also true. So people that supplement with vitamin D3 have a 40% reduced risk of dementia. And there's actually even been studies in people with dementia and people with Alzheimer's disease that were given a vitamin D supplement or a placebo control.And those individuals given the vitamin D supplement had improved cognition. They had um lower markers of amalloid plaques. So those were this will those were also mea ...