A friend of mine runs an HCG company. I won't point out which one. But I will tell you this...
If what you're buying actually had any measurable amount of HCG in it, you could not buy it without a prescription. In order to stay on the good side of the law, he had to put disclaimers (small text, impossible to find) saying, essentially, that there was no actual HCG in it. It's homeopathic stuff, meaning that even if they DID actually start out with some HCG, it's been diluted so many times that there would be at MOST a few individual molecules of it in your entire bottle.
Now, he also has a huge number of people that have reported success, and a remarkably low rate of returns. Does that mean that the magic water has some power over your body? No. The point is that if you eat well, exercise, live well, and you can lose weight. The little bottle of HCG isn't helping you in any way, other than giving you some reason to believe that you can do it - and hence, follow through with the lifestyle.