Unless it's raw goat milk, it may still be the milk. Once the milk is a problem, then the wheat is the next major area of concern. When we cut out these two products for my son, years ago, things got better -- but at the time we went through a major diet change and we were mega-supplementing him as well -- we had muscle-testing done and there were numerous foods that were causing him problems. We got it all cleared up; it was great. I now would use herbs rather than supplements.
The Barefoot Herbalist has a great anti- parasite formula, etc. There is also his 108-page booklet for free -- talks about liver flushes, etc., which is certainly the way to go.
Your friend needs to do reading and take charge of his health -- this is Life tapping him on the shoulder!