Far the best way of getting vitamin D is of course, the sun whenever possible

Highly recommend seeing this video even if you can forget about all the biochemistry, just to see how amazing nature is created It would be worth it for Israel to ask permission to make a Hebrew -simplified- version of this video[with most biochemistry to be left out]

With simple words: get out in the air as much as possible even if the sun is not shining!

As I wrote in an earlier mail may we have the “zchut”[“luck”] to be guided by the authorities on how to manage in-room lightning, especially schools,”cheder[im]” and yeshivot where people spend so many hours every day.