After about 3 months of moving (unknowingly) to a high allergy city, my very healthy 3 year old son began experiencing several bouts with croup and respiratory infections. He was later diagnosed with asthma. He has been taking this for about 6 - 8 weeks and has been exposed countless times to other children with colds without catching one himself...No more apparent need for breathing treatments either :). I believe that this supplement will greatly reduce his chances of developing a virus. I am taking the adult version myself (with the same success) and I will continue to give him this supplement during allergy season.