My son was taking the 4 Life Transfer Factor Advanced formula (colostrum and egg york extract) for 4 months since June-Oct 2009. Due to the expensive costs, i stopped giving him this product since Nov 2009. I found that he is easily getting sick after a few months stopped taking this product. Is there any side effects of this product? Is his immunity system becoming weaker than last time (before taking the product) after stopped consuming the product?