The most important thing is that you establish a healthy balanced diet. A diet with lots of fruit and vegetables, contains more than enough vitamins. Unfortunately, I am not aware of any "immune boost" product with proven efficacy. The first year at chreche is usually the worst and sometimes the best answer to break the cycle of recurrent infections is to take your child out of chreche for a few weeks if possible, to recover completely and to rebuild his own defenses.
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