I have never personally been a fan of the HCG diet. The diet consists of taking a shot of the HCG hormone each day and following a 500 calorie diet. There is no long-term support or transition phase to this diet.
A recent study is showing that there may be no benefit to the program at all. In fact, according to this research, the weight loss may simply be due to the extremely low calorie intake and not the hormones at all.
My other concern with the program is the side effects I heard some people talk about experiencing, including the loss of their hair and other more severe problems. Read about the research through the Dr. Oz website and let me know your opinion.