Current state of knowledge on the topic of Covid-19 / Vitamin D based on published scientific and clinical studies
From the letter:
It would be sufficient to measure the vitamin D level in Covid-19 infected persons, hospital staff and at risk patients and, if necessary, to raise it to healthy levels well above 35 ng/ml. In any case, no comparison to the enormous costs of the lockdown. This could possibly save us another lockdown and many more Covid-19 fatalities.