To some extent everyone's immune system needs supporting. I take a daily probiotic and I eat very well. I do try to get the kids to have it, but I am running out of ways to hide it LOL. I think if you are overly concerned about it, I would support his immune system by using a probiotic, rather than relying on a formula to do it. Plus I do doubt the integrity of the probiotic in it as it is not 'live'. I would prefer to use In-Liven as I know I can trust it kwim?