What vitamins, supplement do you all take or give to your kids?

[naturallyspeaking]

For the health and to boost immune system???
I'm getting depressed because my kids my dh have been sick weeks after weeks from coughing, stomach bug and getting antibiotics.
Also is there something we can take when we feel like we are coming down with something?? (especially, when kids get sick, I don't want to get sick from them...)
Thank you.