Monique is right on the money--these are all good things. The DHA is critical, and I'd definitely start with that and get him used to taking it. Taking a Cal-Mag-Zinc daily is a good way to get, in one package, 3 things that CFers need, too.

If I had to add anything to Monique's list, I might add Vit K--antibiotics deplete that, also, and the ABDEKs don't have a high enough dose to keep CFers normal, it seems from recent research.

We have had great success using lecithin and a non-prescription bile acid formulation at big mealtimes.

Last, if you are into antioxidants of all stripes, as we are, you might put alpha-lipoic acid and Co Q-10 on the list, too.