Boost immune system?

what are some things i could eat/drink/do so that i can make it easier to resist colds and stuffBoost immune system?
DRINK LOTS OF ORANGE JUICE AND WASH YOUR HANDS AFTER GOING TO THE BATHROOM
TAKE VITAMIN C SUPPLEMENTS
EAT YOGURT THAT BUILDS YOUR IMMUNE SYSTEM
Take vitamin c pills weekly - that's what I have been doing and it hasn't failed me yet!
Take olive leaf every day
you may eat coconut--drink cranberry juice-- eat lots of fruits and veggies. Sleep the recommended amt--drink plenty of water.
I swear that the new yogurt drink,
which is to strengthen immune system does work...
DanActive by Dannon...
A friend of mine says that new stuff
called airborne works good for her family...
Never hurts to try.
All of the above plus a new yogurt product DAN ACTIVE which builds your immune system in your digestive track. Can be found in the yogurt section of your grocery store.