hormoneInjectablePrescription only (US)Prohibited in male athletes under WADA S2
HCGBenefits, Dosage & Interactions
Also known as: human chorionic gonadotropin
Human chorionic gonadotropin (hCG) is a glycoprotein hormone produced by the placenta shortly after implantation — it is the hormone pregnancy tests detect. Research on HCG focuses on testosterone support. HCG is administered by injection rather than orally. The reported plasma half-life is about 33 hours, which shapes dosing frequency.
Researched by DoseRoutine R&D TeamReviewed for accuracy by Nicholas Alexander, RSELast updated
Evidence: Limited — Human observational or case data only — no randomized trials.
Evidence strengthLimited · 2/4
PreclinicalStrong human evidence
Human observational or case data only — no randomized trials.
Quick answer
Human chorionic gonadotropin (hCG) is a glycoprotein hormone produced by the placenta shortly after implantation — it is the hormone pregnancy tests detect. Structurally it closely resembles luteinising hormone and binds the same receptor, which is why clinicians use it to trigger ovulation in fertility treatment, to treat certain forms of hypogonadism, and to maintain testicular function and fertility in men on testosterone therapy.
- Full name
- Human chorionic gonadotropin
- Produced by
- Placental syncytiotrophoblast after implantation
- Acts on
- The LH receptor — hence its clinical uses
- Clinical uses
- Ovulation trigger, hypogonadotropic hypogonadism, TRT adjunct
- Route
- Subcutaneous or intramuscular injection (prescription)
- Detected by
- Urine and serum pregnancy tests; also a tumour marker
Compiled by DoseRoutine from public sources including NIH/MedlinePlus, the FDA label, Mayo Clinic and PubChem. Educational information, not medical advice.
Plasma half-life
~33 h
Default unit
iu
What published protocols report
Ranges documented in the literature, shown for reference. DoseRoutine does not recommend an amount — your prescriber or the product label sets the dose.
Worked example: a 5 mg vial reconstituted with 2 ml of bacteriostatic water gives 2.5 mg/ml, so a 250 mcg amount measures 10 units on a U-100 syringe. Open this in the reconstitution calculator.
Reported for HCG in the cited sources. Published ranges are not dosing advice.
References & evidence
Documents the HCG entry is written from. Each number matches an inline marker above.
- [1]A combined analysis of data to identify predictive factors for spermatogenesis in men with hypogonadotropic hypogonadism treated with recombinant human follicle-stimulating hormone and human chorionic gonadotropinWarne DW, Decosterd G, Okada H, et al. · Fertility and Sterility · 2009 · Peer-reviewed · PMID 18930225
- [2]Addition of recombinant follicle-stimulating hormone to human chorionic gonadotropin treatment in adolescents and young adults with hypogonadotropic hypogonadism promotes normal testicular growth and may promote early spermatogenesisZacharin M, Sabin MA, Nair VV, Dabadghao P · Fertility and Sterility · 2012 · Peer-reviewed · PMID 22763096
How to track HCG doses
HCG is tracked as a protocol rather than a single reminder: a vial with a concentration, a schedule that may be titrated or cycled, and a rotation of injection sites. Here is the record that keeps all three consistent.
- 1
Record the vial and concentration
Log the vial strength and the volume of bacteriostatic water you added so HCG is stored as a concentration rather than a guess. DoseRoutine converts that into iu per syringe unit and counts the doses left in the vial as you log.
- 2
Set the schedule, not just a reminder
Enter the dose in iu and the frequency. Cycled protocols get a start and end date so the history stays accurate when HCG comes out of the routine.
- 3
Rotate and log the injection site
Pick the site at the moment you log the dose. The site map shows what you used last and how recently, which is the part that drifts fastest when two compounds run on different frequencies.
- 4
Log adherence, not intentions
Mark each dose taken, skipped or delayed as it happens. Weeks of honest logs are what make an adherence rate or a trend line meaningful; retrospective guessing is not.
- 5
Review against outcomes
With a reported half-life around 33 h, effects and timing shifts show up over days rather than instantly. Review HCG alongside your logged metrics and any relevant blood work every few weeks before changing the dose.
What to log each time
- Dose in iu and the syringe units it worked out to
- Vial: reconstitution date, concentration, doses remaining
- Injection site and time
- Any side effects in the 24 h after the dose
References & Evidence
Sources on this page that document HCG dosing, timing and safety.
- [1]National Center for Biotechnology Information View source
Educational information only — not medical advice. Dose ranges vary by person, indication and prescriber.
What is HCG studied for?
What is HCG?Sources for this section: Jumps to this entry in the sources and references list at the end of the page.
Human chorionic gonadotropin (HCG) is a glycoprotein hormone naturally produced by the placenta during pregnancy. Structurally, it is composed of an alpha subunit identical to that of luteinizing hormone (LH), follicle-stimulating hormone (FSH), and thyroid-stimulating hormone (TSH), and a distinct beta subunit that confers its specific biological activity. In clinical settings, HCG is used as a medication for various indications, primarily related to fertility and hormonal balance. The HCG used therapeutically is either derived from the urine of pregnant women or produced recombinantly. Its primary action mimics that of LH, stimulating the production of gonadal steroid hormones.
What does the research say about HCG?
Tap a section to expand.
HCG binds to and activates the luteinizing hormone/choriogonadotropin receptor (LHCGR) on target cells, predominantly in the gonads. In males, this stimulation leads to the production of testosterone by the Leydig cells in the testes, which is crucial for spermatogenesis and the development of secondary sexual characteristics. In females, HCG can trigger ovulation by inducing the final maturation of ovarian follicles and corpus luteum formation, similar to the natural LH surge. It also supports the maintenance of the corpus luteum in early pregnancy, stimulating progesterone production. The biological half-life of exogenously administered HCG is extended compared to natural LH, contributing to its sustained therapeutic effects. (Source: DrugBank, PubChem)
Source for this section: Sources for How does HCG work?: Jumps to this entry in the sources and references list at the end of the page.
HCG is utilized in medicine for specific therapeutic purposes, primarily concerning fertility and hormonal conditions. In males, it is prescribed for the treatment of hypogonadism, specifically when the condition is due to insufficient pituitary gonadotropin secretion (hypogonadotropic hypogonadism). By stimulating endogenous testosterone production, HCG can aid in restoring spermatogenesis and addressing symptoms associated with low testosterone levels. It is also used to induce testicular descent in some cases of pre-pubertal cryptorchidism. In females, HCG is used in assisted reproductive technologies (ART) to trigger ovulation in women undergoing fertility treatments, such as in vitro fertilization (IVF) or controlled ovarian hyperstimulation. It mimics the natural LH surge to induce final follicular maturation and egg release. Additionally, HCG may be used in certain cases to support the corpus luteum, which produces progesterone essential for maintaining early pregnancy. (Source: FDA label, MedlinePlus)
Clinical evidence for HCG's efficacy in treating male hypogonadotropic hypogonadism demonstrates its ability to stimulate endogenous testosterone production and promote spermatogenesis. Studies have shown improvements in sperm count and fertility outcomes in men receiving HCG therapy (Source: Cochrane review, clinical trials). For female infertility, HCG's role in triggering ovulation in ART cycles is well-established. Numerous clinical trials and meta-analyses support its effectiveness in inducing oocyte maturation and subsequent pregnancy rates when used as part of a controlled ovarian hyperstimulation protocol (Source: Cochrane review, medical literature reviews). The use of HCG for weight loss or other unapproved indications is not supported by scientific evidence and is considered off-label and inappropriate. (Source: NIH ODS, reputable medical organizations)
Potential side effects associated with HCG administration can vary depending on the individual, dosage, and duration of treatment. In males, common side effects may include injection site reactions (pain, bruising, swelling), headache, irritability, depression, restlessness, and gynecologic symptoms such as breast tenderness or enlargement. In females, particularly during fertility treatments, a significant concern is ovarian hyperstimulation syndrome (OHSS), which can range from mild to severe. Symptoms of OHSS include abdominal pain, bloating, nausea, vomiting, diarrhea, and in more severe cases, rapid weight gain, fluid accumulation, electrolyte imbalances, and blood clots. Other possible side effects in females include headache, fatigue, irritability, and injection site reactions. Allergic reactions, though rare, can also occur. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
HCG should always be used under the supervision of a licensed clinician due to the potential for significant side effects and specific patient considerations. Special caution is advised in individuals with a history of hormone-dependent tumors, as HCG can stimulate hormone production. Patients with pre-existing cardiovascular conditions, renal impairment, or migraine should be closely monitored, as fluid retention can occur. Thromboembolic events (blood clots) have been reported, particularly in women undergoing ovarian stimulation, and clinicians should assess individual risk factors. In males, prolonged HCG administration can lead to pubertal precocity if used inappropriately, and prostate enlargement may occur. Patients should be educated on the signs and symptoms of side effects, especially OHSS in females, and instructed to seek immediate medical attention if severe symptoms develop. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
HCG is contraindicated in individuals with a known hypersensitivity to HCG or any of its excipients. It should not be used in cases of precocious puberty. In males, it is contraindicated in patients with prostate carcinoma or other androgen-dependent neoplasms. In females, absolute contraindications include primary ovarian failure, uncontrolled thyroid or adrenal dysfunction, presence of a sex hormone-dependent tumor, primary pituitary failure, or abnormal uterine bleeding of undetermined origin. HCG is also contraindicated for use in women who are pregnant or breastfeeding, outside of specific diagnostic or therapeutic uses where deemed absolutely necessary by a clinician. Severe ovarian hyperstimulation syndrome (OHSS) is also considered a contraindication for further HCG administration within the same cycle. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Given that HCG is a prescription medication, its co-administration with other medications should always be reviewed by a licensed clinician to prevent potential interactions. Concomitant use with other fertility medications (e.g., clomiphene, gonadotropins) is often part of a controlled protocol, but careful monitoring is required. No specific general contraindications for mixing with common over-the-counter medications are widely established, but any concomitant prescription drugs, herbal supplements, or non-prescription remedies could potentially alter HCG's effects or be affected by HCG. For instance, drugs affecting hormonal balance could theoretically interact. Always inform your prescribing physician about all medications and supplements you are taking. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
HCG is typically administered by injection, either subcutaneously (under the skin) or intramuscularly (into a muscle), depending on the specific product and treatment protocol. The frequency and timing of injections are highly individualized, determined by a licensed clinician based on the specific medical condition being treated, the patient's response, and the overall treatment plan. For male hypogonadism, administration might be two to three times per week. In female fertility treatments, a single dose is often given to trigger ovulation, at a very specific point in the menstrual cycle, following monitoring of follicular development. The optimal timing is critical for therapeutic success and to minimize risks. Patients are educated by their clinician on the proper technique for self-administration, if applicable, and adherence to the prescribed schedule is essential.
Source for this section: Sources for When should you take HCG?: Jumps to this entry in the sources and references list at the end of the page.
What interacts with HCG?
| Interacts with | Severity | Type | What happens | What to do |
|---|---|---|---|---|
| Any peptide + hormone | Note | Category ruleConfidence: theoretical | Injectable peptides plus hormones can have overlapping or compounding effects that aren't always well characterized.Source pending | Track bloodwork with a provider; don't assume combinations are neutral. |
| Testosterone Cypionate | Complementary | Compound pairConfidence: theoretical | HCG maintains intratesticular testosterone and testicular size during exogenous testosterone use.Source pending | Typical protocol: 250–500 IU HCG 2–3× weekly alongside TRT. |
Frequently asked questions about HCG
In men, HCG is primarily used to treat hypogonadotropic hypogonadism, a condition where the testes do not produce enough testosterone due to a problem with the pituitary gland. It stimulates the testes to produce testosterone and can help with sperm production.
In women, HCG is used in assisted reproductive technologies (ART) to trigger ovulation. It mimics the natural LH surge to induce the final maturation and release of eggs from the ovaries, often after a period of ovarian stimulation.
No, HCG is not approved by the FDA for weight loss. The use of HCG for weight loss is considered unproven and potentially dangerous, and there is no scientific evidence to support its effectiveness for this purpose.
HCG is administered by injection, either subcutaneously (under the skin) or intramuscularly (into a muscle). The specific method and frequency depend on the individual’s treatment plan as directed by a healthcare professional.
One of the most serious side effects for women undergoing fertility treatment with HCG is ovarian hyperstimulation syndrome (OHSS), which can lead to severe abdominal pain, swelling, and other serious complications. Close monitoring by a clinician is essential.
As a hormone, HCG can overlap with other supplements, prescription medicines, hormones and peptides. With a reported plasma half-life near 33 hours, separating doses can change the picture as much as removing one. Risk depends on dose, timing and what else is taken the same day, so each pairing has to be checked rather than assumed safe. The free checker at https://doseroutine.com/interaction-checker covers HCG with no sign-up.
HCG is administered by injection, so the measured volume — not a tablet count — is the unit that matters. The reported plasma half-life is about 33 hours, which is what drives how often it is redosed. It is a controlled substance in some jurisdictions, so the prescribed amount is the only appropriate one. Amounts for this hormone vary by protocol, formulation and individual response, so follow the dose your clinician or the product label specifies.
Whether HCG fits alongside testosterone replacement therapy depends on the protocol — dose, ester and ancillaries such as HCG or anastrozole — and on current bloodwork. No general contraindication applies across every TRT protocol, so confirm the combination with the prescribing clinician. See the free TRT interaction reference: https://doseroutine.com/trt-supplement-interactions
"Peptides" is not one category — healing peptides, GLP-1 agonists, growth-hormone secretagogues and melanocortins each behave differently next to HCG. Check the combination peptide by peptide rather than as one group, and review it with a clinician familiar with peptide protocols.
With a plasma half-life near 33 hours, once-daily dosing is the usual pattern for HCG. Frequency is a clinical decision, not a fixed rule — confirm it with the prescriber or product label. Comparison of apps that keep a schedule like this: https://doseroutine.com/best-dose-tracking-apps
With a plasma half-life near 33 hours, a single missed dose of HCG usually has a smaller effect on overall exposure than an irregular pattern of missed doses does. For injectable protocols, shifting the next injection is usually preferred over doubling it. Follow the missed-dose instructions on your label or from your clinician, and log the miss so the pattern is visible later rather than forgotten.
For an injectable like HCG the record needs more than a checkbox: vial concentration, the measured volume, and which site the last injection went into. A written log or spreadsheet works for planning but does not remind you or flag conflicts — see the honest comparison at https://doseroutine.com/vs/spreadsheet and the wider roundup at https://doseroutine.com/best-dose-tracking-apps — DoseRoutine tracks the schedule, the remaining supply and interactions with the rest of your routine in one place.
HCG signals the corpus luteum to keep producing progesterone until the placenta takes over around weeks 8–10, which maintains the uterine lining. Levels roughly double every 48–72 hours in early pregnancy and peak near weeks 8–11, which is why serial measurements are used to assess viability. This is educational information, not medical advice.
Exogenous testosterone suppresses LH, and without LH the testes shrink and sperm production falls. Because hCG binds the LH receptor, it keeps that signal running — endocrinology practice uses it alongside TRT to preserve testicular volume and fertility. It is prescription-only and requires monitoring. This is educational information, not medical advice.
No. Randomized trials comparing hCG with placebo alongside a very-low-calorie diet found no difference in weight loss, hunger or fat distribution; any loss came from the extreme calorie restriction. The FDA prohibits marketing hCG for weight loss and requires labeling saying it is ineffective for that purpose. This is educational information, not medical advice.
Yes. Certain germ cell and trophoblastic tumours secrete hCG, which is why it functions as a tumour marker, and low-level elevations occur in some pituitary conditions and in older age. Unexpected elevation needs clinical evaluation rather than self-interpretation. This is educational information, not medical advice.
Which studies looked at HCG?
Peer-reviewed research indexed in PubMed. Each entry links to the original record.
- 1.Gonadotropins for pubertal induction in males with hypogonadotropic hypogonadism: systematic review and meta-analysis(opens PubMed in a new tab)Eur J Endocrinol · 2024 · PMID 38128110 · https://pubmed.ncbi.nlm.nih.gov/38128110/
- 2.Dual trigger improves the pregnancy rate in fresh in vitro fertilization (IVF) cycles compared with the human chorionic gonadotropin (hCG) trigger: a systematic review and meta-analysis of randomized trials(opens PubMed in a new tab)J Assist Reprod Genet · 2023 · PMID 37466846 · https://pubmed.ncbi.nlm.nih.gov/37466846/
Sources cited on this page
Specific documents referenced by the numbered markers above. Each number matches the marker in the text.
- PubChem CID 16131408(opens in a new tab)National Center for Biotechnology Information · pubchem.ncbi.nlm.nih.gov/compound/16131408
Verify at
Publisher search links for HCG. These are places to check the information — they are not citations, so they are not numbered.
- MedlinePlus(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- DrugBank(publisher search, opens in a new tab)DrugBank Online · publisher search
- FDA-approved labeling (DailyMed)(publisher search, opens in a new tab)U.S. Food and Drug Administration · publisher search
- Cochrane Library(publisher search, opens in a new tab)Cochrane · publisher search
- NIH Office of Dietary Supplements(publisher search, opens in a new tab)National Institutes of Health · publisher search
- Mayo Clinic(publisher search, opens in a new tab)Mayo Clinic · publisher search
- PubMed literature search(publisher search, opens in a new tab)National Library of Medicine · publisher search
- Wikipedia entry(publisher search, opens in a new tab)Wikipedia · publisher search
DoseRoutine compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician. How we source and review this information.
What is the short answer on HCG?
Plain-text summary, safe to quote verbatim:
Human chorionic gonadotropin (hCG) is a glycoprotein hormone produced by the placenta shortly after implantation - it is the hormone pregnancy tests detect. Research on HCG focuses on testosterone support. HCG is administered by injection rather than orally. The reported plasma half-life is about 33 hours, which shapes dosing frequency.
Source: DoseRoutine — https://doseroutine.com/library/hcg
Cite this page
Using this in an article, AI answer, or research note? Please attribute:
DoseRoutine. (2026). HCG — Overview, Benefits & Side Effects. Retrieved from https://doseroutine.com/library/hcg
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Others in the hormone category or studied for the same goals.
Which goals is HCG used for?
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