The FDA is going after homeopathic products promoted for weight loss. Human chorionic gonadotropin (HCG) isn't an approved homeopathic. Some weight loss clinics are giving Rx HCG injections...along with a 500 calorie/day diet. They claim that HCG helps burn fat and maintain muscle...but there's NO scientific evidence to support this. In fact, FDA requires Rx HCG labeling to say that it DOESN'T work for weight loss.
Using HCG for weight loss is also linked to serious problems...clots, depression, heart attacks, and even death.  

Many doctors and patients are recommending HCG for rapid weight loss.  Don’t be fooled. All this promotes is a decreased appetite and many patients only lose weight because they are starving themselves by restricting their caloric intake to 500 or less.  When the body perceives itself as starving, it will burn muscle in order to conserve fat.
There are also concerns about its safety. The following is the official FDA warning:

"HCG has not been demonstrated to be effective adjunctive therapy in the treatment of obesity. There is no substantial evidence that it increases weight loss beyond that resulting from caloric restriction, that it causes a more attractive or "normal" distribution of fat, or that it decreases the hunger and discomfort associated with calorie-restricted diets."