If you have central heating - have you got a good filter and is it cleaned regularly?
maybe have a look into an ionizer (negative ion generator)? they're supposed to keep dust particles from floating in the air.
one more thing about vitamins - personally since I started taking Usana vitamins (originate in Canada) they're the best thing I've ever taken to keep my immune system up! (and I'm a teacher!) ...a bit on the expensive side though but definitely worth it (coming from a person who never believed in vitamins before).




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