What are your thoughts on Echinacea, Propolis, and Vitamin C?

[mmmeyer103]

My daughter is 4 years old. I breastfed her for 3.5 years. Now that she entered preK she is always sick with a cold or virus of some kind. It does seem like every week she is coming down with something new. What are your thoughts about boosting the immune system with Echinacea, Propolis, and/or Vitamin C? I read about a study that said the combo of the 3 really works. There is a product called Chizukit that combines all 3, but I can not seem to find it in US. Do you know where to find it? What brand of Propolis is safe for children? And what would the dosage be for a 4 year old 40lbs be?

[DrBobSears]

I do like echinacea 250 mg twice daily, Vit C 500 mg once daily and Zinc  15 mg once daily for a child that age as a combo for kids.  don't know about Propolis though.