Here's a positive result. https://www.bmj.com/content/356/bmj.i6583 https://www.bmj.com/content/356/bmj.i6583 "Vitamin D supplementation was safe and it prote

Here's a positive result. https://www.bmj.com/content/356/bmj.i6583 https://www.bmj.com/content/356/bmj.i6583 "Vitamin D supplementation was safe and it protected against acute respiratory tract infection overall. Patients who were very vitamin D deficient and those not receiving bolus doses experienced the most benefit."