After talking with a friend on Friday afternoon, I wanted to post this thought. For children who have taken several rounds of antibiotics or who frequently take over-the-counter symptom relievers, response time to immune builders may be slower. This is because their immune systems have atrophied, in a sense. Their systems will need to be rebuilt in order to function efficiently. Don't give up! It may take longer for them to respond, but if their health is not critical, consider letting their own immune systems do the work they were designed for.
NOTE: I am not a medical professional : ) This is my mother-to-mother suggestion for the long term health of our children.