Double Your Vitamin D Intake

This should prove healthy:

NPR : Research Suggests Increasing Vitamin D Exposure

In some fracture and bone health studies, patients see benefits with supplements of 800 international units of vitamin D. This is double the amount currently recommended by the government-sponsored Food and Nutrition Board of the National Academy of Sciences.

In the book Fantastic Voyage: Live Long Enough to Live Forever, Ray Kurzweil and Terry Goodman claim that the "Daily Recommended Dose" is what the FDA determined was necessary for human to live an averagely healthy life - not what was the optimal amount we can use to be as healthy as possible. 

Perhaps this research will open the door to more vitamins getting an increase in the DRD.