The site is not intentionally or specifically accepting advertising from HCG products. The site uses "Google Adsense" ads which simply display ads based on keywords, at the discretion of Google - not 3FC or IB.
Unfortunately, Google does not allow a specific type of product to be blocked from advertising. However, it does allow domain blocking. What we do is when we see Google display an ad for an HCG product, we send the domain (listed under the ad) to our advertising manager and he enters it into the Google filter so that particular company is blocked from advertising through Google on this site again. We keep sending them, but unfortunately there are so many more HCG sellers out there in the Google ad system that they keep getting replaced. And for some reason, the blocked ones get unblocked and have to be blocked again. It's a never ending battle.
If this is something you seriously want to consider, please ask your current doctor for advice. He or she will be able to give you any facts about it and let you know if you should or shouldn't try it. That would be about the most unbiased and reliable opinion you can get.