My herblism teacher swears by this stuff. I am definitely buying some for the new year to keep my body and immune system up to par!
In addition, the herbs to keep in mind that boost the immune system:
Astragalus - for everyday use
Ashwagandha - for everyday use
Mushrooms - immune enhancer, cancer reducer
Take care of yourselves in TWENTY TEN! Make a resolution that benefits the health of your body. Preventative medicine is the best medicine.