This is my take on the hCG diet after reading about at medical sites and not at sites promoting hCG for monetary gain..
On the program, the dieters may consume less than 500 calories a day. Anyone that consuming less than 500 calories a day would lose enormous amounts of weight without the need for supplementing with hCG. There are reports of individuals losing 30lbs in one month. A 1200 calorie is the minimal caloric intake recommended by many nutritionists and medical professionals when dieting.
Caloric intake less than this would result in nutritional deficiencies and adversely effect ones health. Although I find it hard to believe, the average reported caloric intake at the Auschwitz death camp was around 1500 calories a day.
What is hCG? HCG is the hormone found in pregnancy. Advocates of the diet believe it suppresses appetite. This doesn't make much sense to me. Pregnancy can result in a ravenous appetite for many women resulting in profound weight gain.
The following was quoted from this article http://www.huffingtonpost.com/2011/02/22/hcg-diet-controversy_n_826837.html
...The idea of using hCG injections to curb appetite was introduced over 50 years ago and has been carefully studied in over a dozen well-done trials. Every single well-done trial showed that the hCG injections were no better than injecting a salt-water placebo. In other words, people injected with hCG lost the same amount of weight as people injected with a salt-water placebo.
hCG is by prescription only and buying over the counter is probably illegal, but I'm not a lawyer. You need to check this out..
HCG is a protein, so I don't believe taking it by mouth would work. All proteins are digested by the GI tract into their individual amino acids. That's the reason why protein hormones like insulin and growth hormone needed to be injected to avoid digestion by the GI tract.