There is also this[1] meta study that claims that you are only about half as likely to catch a cold if you treat your vitamin D deficiency. https://www.bmj.com/

There is also this[1] meta study that claims that you are only about half as likely to catch a cold if you treat your vitamin D deficiency. https://www.bmj.com/content/356/bmj.i6583 https://www.bmj.com/content/356/bmj.i6583 It also predates the COVID craze. [1] https://www.bmj.com/content/356/bmj.i6583 https://www.bmj.com/content/356/bmj.i6583