Vitamin D supplements (IMAGE) University of South Australia Caption New genetic research shows a direct link between dementia and a lack of vitamin D. Credit Pixabay/PublicDOmainPictures Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.