2 Answers

HCG does not make you lose weight – the diet makes you lose weight! However, the HCG injections change how you lose weight!

By patient report, HCG reduces feelings of hunger. This allows them to eat very little comfortably. Why? It is believed the presence of HCG in the bloodstream takes the appetite away. In pregnant women, HCG often causes feelings of nausea in the early stages of pregnancy.
HCG is a pro-hormone which helps the body make more hormones. Since hormone deficiency or imbalance is usually part of the reason for weight gain, whether it’s your thyroid, or menopause (or andropause), this hormone offers help.
Only HCG injections have been shown to raise blood levels of HCG, so that is the only acceptable way of taking HCG at this time. Any other way of taking HCG, such as drops, pills, or sprays, are likely dissolved before ever reaching the blood, and they do not raise blood levels; this would be like taking nothing at all. An injection is the only proven method of taking HCG at this time. Injections should only be taken with a prescription from a doctor, and under medical supervision.
HCG injections keep you from losing muscle while you diet. By elevating hormone levels in the body, including testosterone, the HCG hormone creates an anabolic state (muscle-building) which counteracts the catabolic state (muscle-breakdown). There are hormone receptors on muscle fibers that respond to the increased hormone levels in patients taking the HCG hormone.

Why does that matter? During a fast, dramatic loss of pounds with crash dieting, there is a high amount of muscle that is lost. Because muscle is heavy, this loss looks good on the scale because the pounds are dropping quickly. When you lose muscle, it’s bad for your body, shape, and metabolism. The metabolism slows so much that dieter regain weight quickly, often regaining all the weight that was lost and then some. Additionally, it takes quite a bit of work to build back the muscle that has been lost.

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Editor’s Note: In December 2011, the FDA and Federal Trade Commission issued warning letters to seven companies marketing over-the-counter hCG products labeled as “homeopathic” for weight loss. The letters warned the companies that they are violating federal law by selling drugs that have not been approved, and by making unsupported claims for the products.

Diets don’t have to be traditional to be effective -- but when a weight loss diet involves injections of hCG (human chorionic gonadotropin), a hormone found in the urine of pregnant women, you better be careful.

Two thirds of U.S. adults are overweight or obese. That staggering statistic drives an insatiable appetite for solutions --preferably ones that are quick and easy.

Some dieters grow frustrated with slow weight loss and start looking for a quick fix. Like the "lose 30 pounds in 30 days" promise in The Weight Loss Cure 'They' Don’t Want You to Know About that promotes hCG.

http://www.webmd.com/diet/features/truth-about-hcg-for-weight-loss 

Does the HCG diet work — and is it safe?

No on both counts. In fact, the Food and Drug Administration (FDA) has advised consumers to steer clear of over-the-counter weight-loss products that contain HCG.

HCG is human chorionic gonadotropin, a hormone produced during pregnancy. As a prescription medication, HCG is used mainly to treat fertility issues. HCG is not approved for over-the-counter use, nor has it been proved to work for weight loss. Companies that sell over-the-counter HCG weight-loss products are breaking the law.

So why has there been so much talk about the HCG diet? Perhaps it's because the diet recommends severe calorie restriction — typically just 500 to 800 calories a day. People who follow such a very low calorie diet are likely to lose weight, at least in the short term. However, that level of calorie restriction has risks, such as gallstone formation, irregular heartbeat, and an imbalance of the electrolytes that keep the body's muscles and nerves functioning properly.

If weight loss is your goal, there are safer ways to lose weight. Talk with your doctor or other health care provider about how to make healthy changes that lead to permanent weight loss, such as eating a balanced diet and getting regular exercise.

 http://www.mayoclinic.com/health/hcg-diet/an02091

No supplement can help you lose weight. Losing weight and keeping it off will only be the result of a (permanent) lifestyle change.....no processed food, no junk food, no sugary drinks, more exercise, more vegetables, more fruit, more water, etc.