Researchers have developed enhanced vitamin K compounds that may help regenerate neurons lost in diseases like Alzheimer’s and Parkinson’s. Credit: Shutterstock Diseases such as Alzheimer's, Parkinson's, and Huntington's slowly damage the brain by destroying neurons, the cells that carry messages through the nervous system. As these cells are lost, people can experience memory problems, cognitive decline, and movement difficulties that often become severe enough to require constant care.