Well, the legitimate science has shown HCG to be ineffective in weight loss. Having written an article/paper on HCG (on more than one occasion), and - trying to be open to everyone's opinions - I've even asked 'scientific' advocates of the HCG specific questions about how they interpret the research and how they propose that HCG claims are still valid despite being (at a most basic inspection) contradictory to basic biological principles.
They were only successful in 1) sidestepping my obvious question and 2) not responding at all. Leads me to believe that either they have no scientific training, or they've put their scientific training secondary to their marketing motives.
Whatever the reason, nobody is really stepping up to the plate.
So, while HCG is a joke, I agree with koolkatt - the 500 calorie diet is effective.
And the only hub I've published is on HCG :)
Whenever I see a post like "so many people can't be wrong." I think - In clinical trials people are always claiming that the sugar pill actually did something to help their disease - so, a lot of people are wrong in a very consistent, predictable, and reliable way.