Vitamin D has been recommended by many experts as a preventive treatment for COVID-19 infection. Vitamin D is produced in the body when the skin is exposed to sunlight. Staying indoors hinders the vitamin D level in the body. During COVID-19 surge, when everyone is suggested to stay indoors, it is very essential to check the vitamin D level in the body.

from Times of India https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/coronavirus-importance-of-vitamin-d-in-covid-prevention/photostory/88878064.cms