The FDA states that HCG is not approved for weight loss and that there is no substantial evidence it increases weight loss beyond calorie restriction. The HCG diet pairs the hormone with a very low calorie diet of about 500 calories a day, which FDA calls dangerous, and a 24-study review found no scientific evidence that HCG causes weight loss. HCG is FDA-approved only as a prescription for specific infertility and hormone conditions.
Key takeaways
- FDA: there are no FDA-approved HCG products for weight loss, and no substantial evidence that HCG increases weight loss beyond calorie restriction.
- HCG is approved as a prescription injection for certain infertility and male hormone conditions, not for weight loss.
- Lijesen 1995 (24 studies, 14 randomized trials) concluded there is no scientific evidence that hCG causes weight loss.
- FDA says a 500-calorie diet is dangerous and lists gallstones, electrolyte imbalance and irregular heartbeat as risks.
- Over-the-counter "homeopathic" HCG products are illegally marketed according to FDA; ask hard questions of any program.
Is HCG approved by the FDA for weight loss?
No. The FDA states that there are no FDA-approved HCG products for weight loss, that HCG has not been shown to treat obesity, and that there is no substantial evidence it increases weight loss [1]. This article repeats that position because every reader deserves to hear it before deciding anything.
HCG (human chorionic gonadotropin) is a hormone made by the placenta. FDA has approved it as a prescription injection for certain cases of female infertility and for hormone treatment in men [1]. The current Pregnyl label on DailyMed (revised 03/2025) lists three indications: prepubertal cryptorchidism not due to anatomical obstruction, selected cases of hypogonadotropic hypogonadism in males, and induction of ovulation and pregnancy in selected anovulatory, infertile women [5]. FDA also says HCG is not approved for use without a prescription for any purpose [2].
The same label carries an explicit statement about obesity, printed in capital letters: HCG "has not been demonstrated to be effective adjunctive therapy in the treatment of obesity." It continues that there is no substantial evidence that HCG 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 [5]. FDA's consumer update quotes an agency official: "the data simply do not support this; any loss is from severe calorie restriction. Not from the HCG" [2]. FDA notes that off-label use carries greater uncertainty about risks and benefits [1].
What was the original Simeons protocol?
In the 1950s, British physician Albert Simeons recommended daily HCG injections combined with a diet of about 500 calories per day [7]. The calorie restriction, not the hormone, is what the evidence points to as the active ingredient [2][6].
Modern products reuse the same structure. FDA says HCG weight-loss products are typically marketed with a very low calorie diet of about 500 calories per day, along with claims such as "reset your metabolism" and losing 20 to 30 pounds in 30 to 40 days [2]. Labels on the over-the-counter "homeopathic" HCG drops that FDA targeted direct use alongside a very low calorie diet [1]. The Medical Letter reports that repeated double-blind studies in the second half of the 20th century found HCG "worthless for weight loss or maintenance" [7].
What do the systematic reviews show?
The best-known systematic review, a criteria-based meta-analysis by Lijesen and colleagues (1995), found no scientific evidence that HCG causes weight loss and called it an inappropriate therapy for weight reduction [6]. The findings below come from the structured abstract of that review in the NCBI Bookshelf database of reviews.
The authors searched MEDLINE from 1966 to 1993 and identified 24 studies: 14 randomized controlled trials (605 participants) and 10 non-randomized studies. Interventions lasted 3 to 8 weeks, and most studies had no follow-up. Twelve of the randomized trials scored above 50 on a 100-point quality scale. The authors did not pool the data because the populations and outcomes were too varied and study quality was low [6].
The reviewers reported that twelve randomized trials found weight loss no greater with HCG than with placebo or diet alone. All 8 trials that measured fat distribution were negative. Of 10 trials that measured hunger, only one was positive, and of 8 that measured well-being, only one was positive [6]. The Centre for Reviews and Dissemination described the review as methodologically rigorous but noted that the record gave no data on the level or duration of obesity [6].
Two limits are worth stating. The review's search ended in 1993, and the FDA statements cited here (pages dated from 2011 to 2020) are the more recent regulatory position [1][2][3]. No Cochrane review of HCG for obesity was among the sources reviewed for this article, so any claim of a "Cochrane-style" or similar review in marketing should be checked against the actual document.
| Item | Finding |
|---|---|
| Studies included | 24 (14 randomized trials with 605 participants, 10 non-randomized) |
| Intervention length | 3 to 8 weeks, most without follow-up |
| Weight loss versus placebo or diet alone | Twelve randomized trials found no greater weight loss with HCG |
| Fat distribution (8 trials measured it) | All negative |
| Hunger (10 trials) | One positive |
| Well-being (8 trials) | One positive |
| Authors' conclusion | "There is no scientific evidence that hCG causes weight-loss" |
What are the risks of the 500-calorie diet?
FDA says living on 500 calories a day is "not only unhealthy but also dangerous," and it lists gallstones, electrolyte imbalance, irregular heartbeat and, in severe cases, death among the risks [2]. FDA adds that a very low calorie diet should only be used under proper medical supervision [1].
Without medical oversight, FDA notes a risk of not getting enough vitamins, minerals and especially protein [2]. The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) explains one mechanism: when weight is lost very quickly, the liver releases extra cholesterol into bile and the gallbladder may not empty properly, which raises gallstone risk. NIDDK lists existing gallstones, a large amount of excess weight beforehand and very rapid weight loss as factors that raise the chance of gallstone problems after a very low-calorie diet, and says repeated weight loss and regain (weight cycling) may also lead to gallstones. It adds that the medicine ursodiol can help prevent gallstones in people who lose weight rapidly, and advises talking with a doctor about lowering gallstone risk before starting such a diet [8].
FDA has also received reports of serious adverse events from HCG injections used for weight loss, including pulmonary embolism, depression, cerebrovascular problems, cardiac arrest and death [1]. Such reports describe events that occurred in people using these products; they do not by themselves establish the size of the risk. They are a reason for the caution FDA advises.
What have the FDA and FTC done about HCG weight-loss products?
On December 6, 2011, FDA and the FTC announced seven joint warning letters to companies selling over-the-counter "homeopathic" HCG products for weight loss, warning the sellers that they were violating federal law by selling drugs that have not been approved [1][3]. FDA's Ilisa Bernstein said the products are "unproven to help with weight loss and are potentially dangerous" even when used as directed [3].
FDA states that all drug products claiming to contain "homeopathic" HCG are illegally marketed, and it advises consumers to stop using HCG weight-loss products, stop following their diet instructions and discard them [1][2].
In October 2013, the FTC filed a complaint in federal court in Arizona against an Arizona marketer and two companies over HCG Platinum drops. The agency alleged the defendants claimed "rapid and substantial weight loss," told consumers to follow a 500 to 800 calorie diet, and marketed two of three formulations as "homeopathic." The FTC reported sales above $13 million since 2010. These were allegations, and the press release states the court would decide the case [4]. The outcome is not covered in the source reviewed.
Why do some people report losing weight on an HCG plan?
People can lose weight quickly on these plans because of the severe calorie restriction, which is the explanation FDA gives, and the trials in the Lijesen review found no greater loss with HCG than with placebo or diet alone [2][6]. A reported loss on the plan is therefore not evidence that the hormone worked.
Two further points matter for anyone weighing the experience of friends or online posts. First, most of the studies in the Lijesen review had no follow-up after the 3 to 8 weeks of treatment, so they say little about what happens afterward [6]. Second, NIDDK says experts recommend beginning with a weight loss of 5 to 10 percent of starting weight over 6 months for people with overweight or obesity, and it notes that weight cycling, the repeated loss and regain of weight, may also lead to gallstones [8]. Sustainable approaches are discussed in our articles on medical weight loss qualification and clinic selection.
What this means in practice: questions to ask about any HCG program
Healthy Weight Loss 4 U lists an HCG program among its services at both locations, and every program begins with a clinician evaluation. A reader considering any HCG program anywhere can use FDA's position as a checklist of hard questions:
- What exactly is the product? FDA-approved prescription HCG, a compounded preparation, or an over-the-counter or "homeopathic" product? FDA says compounded drugs are not FDA-approved and that it does not verify their safety, effectiveness or quality before they are marketed [9]. FDA says homeopathic HCG products are illegally marketed [1].
- How does the clinician reconcile the program with FDA's statement that there is no substantial evidence HCG increases weight loss beyond calorie restriction [1][5]?
- What daily calorie level is used, who supervises it, and which tests or follow-up are planned, given that FDA says a very low calorie diet needs medical supervision [1]?
- How is informed consent handled for off-label use, which FDA says carries greater uncertainty about risks and benefits [1]?
- What is the plan after the diet ends, and how will regain be managed?
- What would the clinic expect to see, and when would it stop?
When should you talk to a clinician?
FDA advises consumers to stop using HCG weight-loss products and to talk to a licensed health care professional about a safe weight-loss plan [2]. Anyone who has had side effects should contact a clinician right away, and adverse events can be reported to FDA's MedWatch program [1]. New or severe symptoms, especially cardiovascular or neurological ones, need urgent evaluation. People with a history of gallstones, heart rhythm problems or electrolyte disorders should raise it before any very low calorie plan [2][8].
Frequently asked questions
Is the HCG diet approved by the FDA?
Does HCG actually cause weight loss?
What is the 500-calorie HCG diet and is it safe?
What is HCG actually approved for?
Are HCG drops, sprays or pellets legal?
What should I ask a clinic offering an HCG program?
Sources
- Questions and Answers on HCG Products for Weight Loss. U.S. Food and Drug Administration, 2016. fda.gov/drugs/medication-health-fraud/questions-and-answers-hcg-produc
- Avoid Dangerous HCG Diet Products. U.S. Food and Drug Administration (Consumer Update), 2020. fda.gov/consumers/consumer-updates/avoid-dangerous-hcg-diet-products
- FDA, FTC act to remove "homeopathic" HCG weight loss products from the market (December 6, 2011). U.S. Food and Drug Administration and Federal Trade Commission, 2011. ftc.gov/system/files/attachments/press-releases/ftc-charges-hcg-market
- FTC Charges HCG Marketer with Deceptive Advertising (press release, October 30, 2013). Federal Trade Commission, 2013. ftc.gov/news-events/news/press-releases/2013/10/ftc-charges-hcg-market
- PREGNYL (choriogonadotropin alfa) kit: prescribing information (revised 03/2025, DailyMed updated December 2, 2025). Organon LLC, via DailyMed (U.S. National Library of Medicine), 2025. dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=1e94155f-19be-4944-b1
- The effect of human chorionic gonadotropin (hCG) in the treatment of obesity by means of the Simeons therapy: a criteria-based meta-analysis (DARE structured abstract of Lijesen et al., Br J Clin Pharmacol 1995). Database of Abstracts of Reviews of Effects, NCBI Bookshelf, 1995. ncbi.nlm.nih.gov/books/NBK66355/
- Human chorionic gonadotropin (hCG) for weight loss. The Medical Letter on Drugs and Therapeutics (issue 1358, February 21, 2011), 2011. liqweb.medicalletter.org/TML-article-1358c
- Dieting & Gallstones. National Institute of Diabetes and Digestive and Kidney Diseases (NIH), 2017. niddk.nih.gov/health-information/digestive-diseases/gallstones/dieting
- Compounding and the FDA: Questions and Answers. U.S. Food and Drug Administration, 2025. fda.gov/drugs/human-drug-compounding/compounding-and-fda-questions-and
Keep reading
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Read →How to Choose a Medical Weight Loss Clinic: 12 Questions
Read →Who Qualifies for Medical Weight Loss? BMI and FDA Criteria
Read →Protein, Meal Planning and Meal Replacements for Weight Loss
Read →Questions about your own situation? A clinician can review your history and goals. Related: HCG Program.