The relation between Vitamin D deficiency and the severity of COVID19 was known within months of the outbreak. It is really upsetting that the medical community has not emphasized this.

It is UVB spectrum that creates Vitamin D. These ultraviolet rays also cause skin cancer; so there is a balance.

Too much sun kills.

My guess is that there is an ideal amount of sun to get each day and that you really don't want to get too much sun.