Hormone & TRT
HCG
Human Chorionic Gonadotropin · Pregnyl · glycoprotein · hormone
A licensed fertility medicine used off-label in TRT programmes to preserve fertility and testicular size — genuine mechanism, established medical use.
Reference status
Editorial research · independent review pending · 3 claims graded
What it is
HCG is a licensed medicine (e.g. Pregnyl), primarily approved for fertility indications. In TRT contexts, it's used off-label because it mimics LH, signalling the testes to keep producing testosterone and sperm even while external testosterone is being administered.
This off-label TRT-adjunct use is common in specialist hormone clinics and is generally considered good practice by many endocrinologists for men wanting to preserve fertility, even though it isn't HCG's originally licensed indication.
The science, graded
What’s claimed — and how strong the evidence behind each claim actually is.
“Preserves fertility and testicular size during TRT”
Mechanistically sound (mimics LH) and widely used in specialist practice, though large dedicated RCTs for this specific off-label use are limited.
Claim-level citation mapping is in progress.
“Maintains natural testosterone production alongside external testosterone”
Consistent with its LH-mimicking mechanism and specialist-clinic experience.
Claim-level citation mapping is in progress.
“A substitute for stopping TRT rather than an adjunct to it”
Its role is to support the testes alongside TRT, not to replace or replicate what TRT does.
Claim-level citation mapping is in progress.
Legal and regulatory context
Separate summaries for Great Britain, the United States, and the European Union. These are preliminary research summaries awaiting independent regional review; they are not legal determinations or advice.
Great Britain
Prescription-only medicine (POM) in the UK. Off-label use in TRT programmes is common via specialist clinics, but still requires a valid prescription.
This is preliminary regulatory research, not a reviewed legal determination or legal advice.
United States
Regional legal and regulatory review required before publication.
This is preliminary regulatory research, not a reviewed legal determination or legal advice.
- FDA's Concerns About Unapproved Drugs · U.S. Food and Drug Administration
European Union
Regional legal and regulatory review required before publication.
This is preliminary regulatory research, not a reviewed legal determination or legal advice.
- Buying medicines online · European Medicines Agency
What the community says
Discussed almost entirely within the TRT-management context, as a well-regarded but sometimes under-prescribed adjunct. Fertility preservation is the main topic.
Where they’re talking
- TRT forumsFertility-preservation and dosing-protocol discussion.
References
- 1.Supply unlicensed medicinal products (specials) · MHRA
- 2.FDA's Concerns About Unapproved Drugs · U.S. Food and Drug Administration
- 3.Buying medicines online · European Medicines Agency