HCG
Also known as: Human Chorionic Gonadotropin, Pregnyl (brand), Ovidrel (brand)
HCG (human chorionic gonadotropin) is a hormone approved in Australia as a prescription medicine for fertility and certain hormonal indications. Off-label use for TRT support or bodybuilding is unapproved and remains prescription-only.
- Category
- Reproductive / Hormonal
- Reported half-life
- Reported ~24-36 hours, which influences the typical every-few-days dosing when used off-label
- Common forms
- Injectable (approved prescription product, e.g. Pregnyl, Ovidrel), Lyophilised powder with diluent (approved), Compounded/grey-market vials (not approved)
- Research status
- APPROVED prescription-only medicine in Australia for fertility and specified hormonal indications. Off-label use for TRT support or bodybuilding is unapproved and remains prescription-only; grey-market versions fall outside the regulated supply chain.
- Last updated
- 21 June 2026
Claimed effects
The following effects are reported or claimed by users and in early research. They are not established medical facts and many are not supported by large human trials.
- Approved and used clinically to support fertility treatment and ovulation induction
- Reported off-label to stimulate testosterone production by mimicking luteinising hormone (LH)
- Reported off-label during or after testosterone therapy to help maintain testicular size and function
- Reported off-label to support fertility preservation in men on testosterone therapy
How it is reported to work
HCG is reported to mimic luteinising hormone (LH). In men it is reported to stimulate the testes to produce testosterone and support sperm production; in women it is used clinically to trigger ovulation. Its approved fertility mechanisms are supported by clinical use, while its off-label use for testosterone support is based on the same LH-like action but is not an approved indication.
What is HCG?
HCG (human chorionic gonadotropin) is a hormone approved in Australia as a prescription medicine for fertility treatment and certain hormonal indications. Off-label use for testosterone (TRT) support or bodybuilding is unapproved and remains prescription-only. This page is educational information, not medical advice, and it does not recommend use.
How does HCG work?
HCG is reported to mimic luteinising hormone (LH). In men it is reported to stimulate the testes to make testosterone and support sperm production; in women it is used clinically to trigger ovulation. The fertility mechanisms are supported by established clinical use, while the off-label testosterone-support use relies on the same LH-like action but is not an approved indication.
What is it approved and used for?
In Australia, HCG is prescribed for fertility-related indications and certain hormonal conditions, as determined by a healthcare professional.
| Use | Regulatory status |
|---|---|
| Fertility / ovulation induction | Approved prescription indication |
| Certain hormonal conditions | Approved prescription indication |
| TRT support (testicular function) | Off-label, prescription-only |
| Bodybuilding | Off-label, unapproved |
What do people use it for off-label (reported)?
Off-label, HCG is reported to be used to maintain testicular size and fertility during testosterone therapy, and in bodybuilding contexts. These are reported off-label uses, not approved indications, and they still require a prescription and monitoring.
Is HCG safe?
Because it is prescription-only, HCG should only be used under medical supervision. Reported side effects include injection-site reactions, headaches, mood changes, fluid retention and, in men, breast tenderness; rare serious effects include ovarian hyperstimulation syndrome in women. A key distinction is between the approved, TGA-regulated product and compounded or grey-market “HCG” sold outside the regulated supply chain: the latter is not approved, and its purity and contents cannot be assured, which is why independent testing is discussed in this community. This article explains what HCG is; it is not an endorsement and does not tell anyone to obtain or use it, and all off-label effects described remain reported claims.
Reported positives & side effects
Compiled from research and community reports. These are reported outcomes, not guarantees or medical advice, individual experiences vary widely.
Reported positives
- Approved, clinically established role in fertility treatment and ovulation induction
- Reported off-label to help maintain testicular size and function during testosterone therapy
- Reported off-label to support sperm production and fertility preservation in men
- Reported LH-like stimulation of natural testosterone production
Common side effects
- Injection-site reactions such as redness or soreness
- Reported headaches and fatigue
- Reported mood changes or irritability
- Reported fluid retention or breast tenderness (including gynaecomastia in men)
- Reported acne or oily skin when testosterone rises
Rare / serious side effects
- Ovarian hyperstimulation syndrome (OHSS) in women, can be serious, seek urgent care
- Allergic reactions
- Blood-clot-related events (reported, uncommon)
- Reactions to contaminated or mislabelled grey-market product
Reported misuse & overdose risks
What has been reported to happen with overuse, excessive dosing, or long-term misuse of HCG. Listed so you can make an informed decision, not to suggest any use is safe.
- Reported use of high off-label doses in bodybuilding, which can raise oestrogen and cause gynaecomastia
- Reported dosing errors and overdoses from unregulated grey-market vials of inconsistent concentration
- Reported stacking with anabolic steroids without medical monitoring, compounding hormonal and cardiovascular risk
- Reported prolonged self-directed use without monitoring of hormone levels or side effects
Reported results timeline
Roughly how long people report it takes to notice effects. A general guide from reports, not a promise, and not advice. A hormonal response is often reported within days, with fuller effects on testosterone or fertility markers building over several weeks under medical supervision.
First effects
Hormonal response reported within days of starting
Noticeable change
Reported changes in testosterone or testicular size over ~4 weeks
Clear results
Reported fuller effects over ~8-12 weeks under medical supervision
Commonly reported dosing & protocol
Reported figures only, NOT a recommendation or dosing advice. These are numbers people report using, compiled for education so you can make an informed decision. We do not advise anyone to take HCG. Many peptides are not approved for human use in Australia. Speak to a qualified healthcare professional.
| Route | Subcutaneous or intramuscular injection (approved product); compounded vials drawn with an insulin syringe |
|---|---|
| Typical reported dose | Reported off-label TRT support: roughly 250-500 IU 2-3× per week. Clinical fertility doses differ and are much higher, set by a prescriber. |
| Frequency | Reported off-label 2-3× weekly for TRT support; fertility dosing follows the clinical protocol |
| Cycle length | Off-label use is reported as ongoing alongside testosterone therapy; fertility use follows the treatment course |
Reported reconstitution (mg → units)
Example for a compounded vial: a 5000 IU vial reconstituted with 1 mL bacteriostatic water gives 5000 IU/mL (5000 ÷ 1 = 5000). A 250 IU dose ≈ 0.05 mL = 5 units on a U-100 insulin syringe (250 ÷ 5000 = 0.05 mL; 0.05 × 100 = 5 units); a 500 IU dose ≈ 0.1 mL = 10 units. The approved product comes with its own diluent and instructions.
Work out the units for your vial → CalculatorFor approved fertility indications, HCG is dosed by a prescriber according to the treatment protocol. Reported off-label TRT-support use is described as low doses a few times per week alongside testosterone therapy, but this is an unapproved indication and still requires a prescription and monitoring. These are reported patterns only, not a recommendation; dosing must be set by a prescriber.
Best used with / commonly stacked with
Combinations people report using together. Reported, not recommended, stacking can increase risks.
Reported alternative for stimulating the reproductive hormone axis; people compare, not necessarily combine
Testosterone therapy
Reported off-label pairing to maintain testicular function during TRT (prescriber-directed only)
Safety notes
HCG is a prescription-only medicine and should only be used under the supervision of a qualified healthcare professional who can assess suitability and monitor for side effects. Off-label use for testosterone support or bodybuilding is not an approved indication and still requires a prescription. Compounded or grey-market versions are not TGA-approved and their quality and contents cannot be assured. Do not use any version without appropriate medical guidance.