I highly doubt there is illegal compounds in the mix. That would be very unscrupulous which in the supplement business is a big no no. IF THERE WERE some sort of banned substances in there, the rest of the supplement world would "black list" him and that is one thing he doesn't want. Its nice to see the supplement industry "look out" for the consumer. Again if you mix your whey protein with anything besides water you will not get the "full" benefits of the supp. I have heard on a rare occasion that people that used lactose free milk recieved remarkable results but that is on an individual basis and not typical.