Anyone will lose weight on 500 kcal per day--HCG or no HCG!
The lose-weight-fast market is largely fad-driven, and often fraud-driven. The FDA (Food and Drug Administration) and the FTC (Federal Trade Commission) has warned manufacturers of weight-loss products containing human chorionic gonadotropin (HCG) that these are illegal. The FDA has posted a short video on the dangers these products pose to dieters.
PositiveTip: Beware of miracle weight-loss products. A balanced, healthful diet combined with physical activity will yield beneficial results.