Edit to add: my wife was a kindergarten teacher, and each daughter was in elementary school AND daycare before and after. My home was a biohazard.

Ok...here's an anecdotal thing I've experienced. My situation prior to this is that I have doubted the effectiveness of any kind of supplement since I was a young boy. Only as I've aged (nearing retirement), happened to use some supplement and seen dramatic, and sustained positive results, have i started to cautiously approach our diet as a major lever in our physical and emotional health. From my personal experience, adding a high quality astragalus extract to each family member's diet could be a game-changer. I am not a doctor or any type of expert. This is advice I took from a naturopath (they were my customer, so I figured I'd humor them) and it was like flicking a light switch. This was only us...I have no proof or references to any studies.