First, oral HCG is necessarily pointless - it's only biologically active if injected. Taken orally, it simply gets digested and does nothing.
Second, even if you receive the injections, decades of controlled, double-blind testing have found no evidence to support any of the proponent's claims. Pasted from an older thread:
The claims regarding HCG have been studied extensively. The results from several decades of research have found no difference between this protocol and a very low calorie diet with a placebo. This is just some
of the research:
Meta-analysis summarizing the controlled and observational studies:The effect of human chorionic gonadotropin (HCG) in the treatment of obesity by means of the Simeons therapy: a criteria-based meta-analysis.
"We conclude that there is no scientific evidence that HCG causes weight-loss, a redistribution of fat, staves off hunger or induces a feeling of well-being. Therefore, the use of HCG should be regarded as an inappropriate therapy for weight reduction, particularly because HCG is obtained from the urine of pregnant women who donate their urine idealistically in the belief that it will be used to treat an entirely different condition, namely infertility."
One controlled double-blind study:Human chorionic gonadotrophin and weight loss. A double-blind, placebo-controlled trial.
Subjects receiving HCG injections showed no advantages over those on placebo in respect of any of the variables recorded. Furthermore, weight loss on our diet was similar to that on severely restricted intake. We conclude that there is no rationale for the use of HCG injections in the treatment of obesity.
A second controlled double-blind study:Ineffectiveness of human chorionic gonadotropin in weight reduction: a double-blind study.
There was no statistically significant difference in the means of the two groups in number of injections received, weight loss, percent of weight loss, hip and waist circumference, weight loss per injections, or in hunger ratings. HCG does not appear to enhance the effectiveness of a rigidly imposed regimen for weight reduction.
A third double-blind study:Chorionic gonadotropin in weight control. A double-blind crossover study.
Serial measurements were made of weight, skin-fold thickness, dropout rates, reasons for dropping out, and patient subjective response. There was no statistically significant difference between those receiving HCG vs placebo during any phase of this study.
Another early meta-analysis that doesn't mince words (PDF file):Human chorionic gonadotropin is of no value in the management of obesity
Other reported adverse effects of treatment with HCG include the following:
* An ovarian overstimulation syndrome, with edema and cyst formation in the ovary, and intra-abdominal hemorrhage requiring laparotomy.
* Multiple pregnancy, with an increased prevalence of immaturity, abortion, perinatal death and preeclampsia.
* Ascites, pleural effusion and other symptoms caused by salt and water retention and edema formation.
* Hypercoagulability and thromboembolism.
Because HCG is ineffective in the treatment of obesity, patients may become discouraged and so not seek or accept treatment that might help them. HCG injections are expensive in both patients' time and physicians' fees and may therefore divert resources from areas of real contribution to the health of the community.
Because HCG "therapy" in the management of obesity has been thoroughly discredited and thus rejected by the majority of the medical community, any practitioner whose patients experience undesirable side effects as a consequence of such therapy may face civil and even criminal liability.
Third, very low calorie diets are not always
hazardous, but they can be, if not done carefully:http://www.ncbi.nlm.nih.gov/pubmed/1784876
Very low calorie diets (VLCD) of 400 to 800 kcal/day appear attractive as they generally show an increase in weight loss from 0.2 to 0.5 kg/week found with the traditional diet to 1.5 to 2.0 kg/week. Early use of very low calorie diets with poor quality protein and loose medical supervision resulted in about 60 deaths, many of which were attributed to loss of lean body mass and in particular, cardiac muscle atrophy. Although current very low calorie diets are presumed safe, concern regarding preservation of lean body mass (LBM) remains. Investigators have used exercise to slow the depletion of lean body mass during very low calorie diets; however, the results are not conclusive.
Bolding the important part - unless steps are taken to preserve lean mass, like getting most of your 500 calories from protein, and doing some exercise, you may be risking having your own heart muscle used for fuel
. If your father is obese, this is, frankly, unlikely, but it's a pointless risk, no matter how remote.
Good luck to you.