You should take 10 micrograms (400 IU) of vitamin D a day between October and early March to keep your bones and muscles healthy.
It is important to take vitamin D as you may have been indoors more than usual this year.
There have been some reports about vitamin D reducing the risk of coronavirus (COVID-19). But there is currently not enough evidence to support taking vitamin D to prevent or treat coronavirus.
Here is some further information on where to buy vitamin D:-