Overview
Human Chorionic Gonadotropin (HCG) is a glycoprotein hormone produced in pregnancy, made by the developing placenta after implantation. It is composed of alpha and beta subunits. HCG's primary role is to support the corpus luteum, which maintains progesterone production crucial for sustaining pregnancy. Outside of pregnancy, HCG is used medically to treat infertility, stimulate testosterone production in males, and in some cases, to treat hypogonadism.
Synthetic or extracted HCG used in treatments is derived from the urine of pregnant women or produced through recombinant DNA technology. The hormone is administered via injection, typically subcutaneous or intramuscular, and its effects mimic the action of luteinizing hormone (LH), stimulating the gonads.
While HCG has been promoted for weight loss, this use is controversial and not supported by robust scientific evidence. The FDA has not approved HCG for weight loss, and its use for this purpose is considered off-label.
Mechanism of Action
HCG acts by binding to the LHCG receptor, which is present on the surface of ovarian cells in females and Leydig cells in males. In females, this binding stimulates the corpus luteum to continue producing progesterone, essential for maintaining the uterine lining and supporting the developing embryo during early pregnancy. In males, HCG stimulates Leydig cells in the testes to produce testosterone.
The alpha subunit of HCG is nearly identical to that of luteinizing hormone (LH), follicle-stimulating hormone (FSH), and thyroid-stimulating hormone (TSH). The beta subunit is unique to HCG, conferring its specific biological activity. HCG’s prolonged half-life compared to LH contributes to its sustained hormonal effects.
Key Benefits
- Stimulates testosterone production in males
- Treats infertility in both males and females (under medical supervision)
- Supports progesterone production during pregnancy
Research & Indications
Research on HCG primarily focuses on its role in reproductive health. It has been used extensively in assisted reproductive technologies (ART) to trigger ovulation in women undergoing fertility treatments. Studies have also investigated its potential in treating male infertility, particularly in cases of hypogonadotropic hypogonadism, where the pituitary gland does not produce sufficient LH and FSH.
Some studies have explored the effects of HCG on metabolic function and appetite, but the evidence supporting its use for weight loss is weak and often contradicted by clinical findings. The use of HCG for weight loss remains controversial due to lack of efficacy and potential risks.
Dosing Protocols
Disclaimer: The following dosing information is not medical advice. Consult with a qualified healthcare professional before using HCG.
| Goal | Dose | Frequency | Route |
|---|---|---|---|
| Testosterone Stimulation (Male Hypogonadism) | 500-1000 IU | 2-3 times per week | SubQ or IM |
| Ovulation Induction (Female Infertility) | 5000-10000 IU | Single dose (under medical supervision) | IM |
Supplies Needed
For a typical multi-dose HCG protocol:
- Peptide Vials: Quantity depends on IU amount and dosing schedule (e.g., multiple 5000 IU vials)
- Insulin Syringes (U-100): Quantity depends on dosing frequency (e.g., 10-30 per month)
- Bacteriostatic Water: 1-2 × 10mL bottles
- Alcohol Swabs: One for vial + one for injection site per injection
Side Effects & Safety
Common side effects of HCG include headache, irritability, restlessness, depression, fatigue, edema, precocious puberty, gynecomastia, and pain at the injection site. In females, ovarian hyperstimulation syndrome (OHSS) is a serious potential risk when HCG is used for ovulation induction.
HCG is contraindicated in individuals with known hypersensitivity to the hormone. It should be used with caution in individuals with asthma, epilepsy, migraine, or cardiac or renal disease. Safety during pregnancy has not been fully established (Category X - known risk), although HCG is naturally produced during pregnancy.
Storage & Handling
Unreconstituted HCG vials should be stored refrigerated at 2-8°C (36-46°F). Once reconstituted with bacteriostatic water, the solution should be refrigerated and used within 30-60 days, depending on the product formulation and manufacturer’s instructions. Avoid freezing and protect from light.