Inhibitor in the tyrosine phosphatase Phase reverses cognitive deficits in a very mouse design of Alzheimer's disease - J Xu - 2014 NAD+ is an enzyme that's essential by all human cells to function, but it surely declines with age. By age fifty, only fifty percent of NAD+ is left http://www.theleftoversnews.com/rapid-techniques-for-brain-health-the-challenges-now/