most people are vitamin D deficient unless they spend alot of time outdoors in Summer. Outside of summer, my Dr. said most people are now Vit D deficient. We spend more time indoors than ever before. The trails from planes everyday turning beautiful blue skies to a soupy mess could have something to do with it as well. One of the side effects of geo-engineering. populations with low vit D, weakening their immune systems ad making them ripe for all kinds of infectiiions...but, don't worry, there will be vaxxinations. You need a minimum of 20 minutes a day of full exposure to the sun, arms, legs, torso to get a required amount of Vit D.