HCG
Human chorionic gonadotropin — FDA-approved for specific fertility and hormonal indications; reclassified as a biologic in 2020, which ended most pharmacy compounding.
What it is
Human chorionic gonadotropin is a real hormone and a real FDA-approved drug — used in fertility treatment and specific hormonal indications for decades. It also drags two complicated legacies: the thoroughly debunked 'HCG diet,' and a 2020 regulatory change that ended most pharmacy compounding of it.
In men's-health and TRT-adjacent clinics, HCG is prescribed off-label to maintain testicular function alongside testosterone — a legitimate, evidence-discussed practice that must now run through approved products rather than cheap compounded versions.
What researchers have actually studied it for
Ovulation induction, male hypogonadism and fertility preservation alongside testosterone — approved and evidence-discussed uses; the weight-loss protocol is a settled negative.
How it works
HCG mimics luteinizing hormone (LH), signaling the gonads directly: in men it drives testicular testosterone production; in women it triggers ovulation. That LH mimicry is both its fertility utility and its appeal alongside exogenous testosterone, which suppresses the body's own LH.
The molecule itself
Not a small peptide but a glycoprotein hormone — two subunits, ~237 amino acids total, heavily sugar-decorated. The alpha subunit is shared with LH, FSH and TSH; the beta subunit gives specificity (and the pregnancy-test target). The glycosylation is why it's a 'biologic' legally.
Where it came from
Isolated from pregnancy biology in the 1920s and a fertility-medicine staple since, HCG detoured through infamy via the 1950s Simeons diet protocol — repeatedly debunked, with FDA requiring explicit disclaimers. In 2020 it was legally reclassified as a biologic, removing it from routine 503A compounding overnight.
The timeline
1920s
Identified in pregnancy urine; bioassay era begins.
1950s
Simeons diet protocol launches the folklore.
1970s+
FDA-required labeling states it's ineffective for weight loss; fertility uses standardize.
2020
BPCIA transition reclassifies it as a biologic — routine compounding ends overnight.
2020s
TRT-adjunct use continues via approved products; gray market fills the compounding gap.
What the research record actually contains
- Established clinical evidence for ovulation induction and specific hypogonadism indications.
- Controlled studies supporting fertility-preservation use alongside testosterone therapy.
- The HCG diet: controlled trials found it adds nothing to caloric restriction — a settled negative.
What could change this assessment
Stable medicine in fertility; the live thread is men's-health prescribing economics post-2020 and recurring shortage dynamics of the approved products.
What's known about risks
Well characterized in clinical use: injection-site effects, potential for ovarian hyperstimulation in fertility contexts, and the general cautions of hormonal therapy. The bigger modern risk is sourcing — post-2020, cheap 'compounded HCG' offers are a red flag by definition.
Where it stands legally
FDA-approved products only, by prescription; the 2020 biologic reclassification ended standard pharmacy compounding, which reshaped men's-health clinic sourcing overnight.
Worth asking a licensed provider
- 1.Is my use case one with actual evidence — fertility, TRT adjunct — or diet-era folklore?
- 2.Post-2020, which approved product is this, and what does it cost through legitimate channels?
- 3.What monitoring goes with LH-mimicking therapy in my situation?
Common claims, corrected
“The HCG diet works if done strictly.”
Reality: Controlled trials repeatedly showed the hormone adds nothing to the 500-calorie starvation protocol around it — the strictness is the entire effect.
“Compounded HCG is still available if you find the right pharmacy.”
Reality: The 2020 biologic reclassification ended lawful 503A compounding; 'compounded HCG' offers since are a regulatory red flag by definition.
HCG FAQ
Does the HCG diet work?
No — controlled trials showed the hormone adds nothing to the starvation-level calorie restriction the protocol pairs it with. FDA requires products to say as much.
Why do TRT clinics prescribe HCG?
Because testosterone therapy suppresses natural LH; HCG's LH mimicry maintains testicular function and fertility. It's off-label but evidence-discussed — a real clinical conversation.
Why did compounded HCG disappear?
A 2020 reclassification made HCG legally a biologic, which standard compounding pharmacies can't produce. Lawful HCG now means approved products — anything else is gray market.
Why do pregnancy tests detect HCG?
Its beta subunit is unique among the glycoprotein hormones — the specific target that makes urine tests work, and the same specificity that makes it useful as an LH mimic in therapy.
Does HCG raise testosterone?
In men, yes — it mimics LH's signal to the testes, the basis of its legitimate fertility and TRT-adjunct uses. That's prescription physiology with monitoring, not a supplement fact.