For men who need higher testosterone but also need to maintain fertility, the standard TRT pathway creates a direct conflict. Exogenous testosterone suppresses sperm production. HCG and enclomiphene offer a different route: raising testosterone through the body's own machinery while keeping the reproductive axis intact.
HCG: Mimicking the Signal
Human chorionic gonadotropin structurally resembles LH — the pituitary hormone that tells Leydig cells to produce testosterone. By injecting HCG, you bypass the suppressed pituitary and directly stimulate testicular testosterone production. The testes stay active, intratesticular testosterone remains adequate for spermatogenesis, and testicular volume is preserved.
HCG as TRT Co-Therapy
The most common clinical use is alongside TRT to maintain fertility and prevent testicular atrophy. The protocol: 500–1500 IU HCG subcutaneously, 2–3 times per week, concurrent with testosterone replacement. Studies show this approach maintains sperm production in the majority of men — though not all — while preserving the benefits of exogenous testosterone.
HCG Monotherapy
Some clinicians use HCG alone to raise testosterone in men with secondary hypogonadism (functioning testes, inadequate pituitary signal). Typical results: total testosterone increases of 200–400 ng/dL from baseline, with maintained or improved semen parameters. The testosterone increase is typically lower than what TRT achieves, but fertility is preserved.
The supply issue: Since the FDA reclassified HCG as a biologic in 2020, compounding pharmacy access has become less reliable. Commercial pharmaceutical HCG (Pregnyl, Novarel) remains available but at higher cost. Some compounding pharmacies continue to produce HCG under specific regulatory pathways, but availability varies by state.
Enclomiphene: Blocking the Brake
Enclomiphene is the trans-isomer of clomiphene citrate. It works by blocking estrogen receptors in the hypothalamus and pituitary, which removes the negative feedback that estrogen exerts on GnRH, LH, and FSH secretion. The result: the pituitary increases LH and FSH output, which stimulates the testes to produce more testosterone and maintain spermatogenesis.
The Mechanism Advantage
Unlike TRT (which replaces) or HCG (which mimics LH), enclomiphene works upstream — it enhances the body's own signaling cascade. The entire HPG axis remains active and functional. This makes it theoretically the most "physiological" approach to raising testosterone.
The Evidence
Phase III trials of enclomiphene showed total testosterone increases to the normal range in men with secondary hypogonadism, with maintained or improved sperm counts and motility. The drug was submitted to the FDA for approval as Androxal but was never approved — Repros Therapeutics received a Complete Response Letter citing manufacturing concerns, not efficacy or safety issues.
Despite the lack of FDA approval, enclomiphene is available through compounding pharmacies. Clinicians prescribing it do so off-label, relying on the clinical trial data and the long track record of clomiphene citrate (which contains both enclomiphene and zuclomiphene isomers) in male fertility medicine.
Enclomiphene vs. Clomiphene
Traditional clomiphene citrate (Clomid) has been used off-label for male hypogonadism for decades. The concern with clomiphene is the zuclomiphene isomer, which has estrogenic activity and accumulates with chronic use, potentially causing visual disturbances and mood effects. Enclomiphene avoids this by providing only the anti-estrogenic isomer.
Head-to-Head Comparison
| Factor | TRT | HCG | Enclomiphene |
|---|---|---|---|
| T increase | Highest (dose-dependent) | Moderate (200–400 ng/dL) | Moderate (200–350 ng/dL) |
| Fertility | Suppresses | Preserves (usually) | Preserves (usually improves) |
| Testicular volume | Shrinks | Maintains | Maintains |
| FDA status | Approved | Approved (as biologic) | Not approved (compounded) |
| Cost | $99–$250/mo | $50–$150/mo (supply-variable) | $50–$120/mo (compounded) |
| Administration | Injection (weekly) | Injection (2–3x/week) | Oral (daily) |
Who Should Consider Each
Decision Guide
- HCG co-therapy: Men committed to TRT who also want fertility preservation. Best evidence-based approach for maintaining sperm production alongside exogenous testosterone.
- HCG monotherapy: Men with secondary hypogonadism who want moderate testosterone increase without suppressing fertility. Accepts lower T ceiling.
- Enclomiphene: Men who want to raise testosterone, preserve fertility, and avoid injections entirely. Ideal for younger men with secondary hypogonadism who may want children.
- Standard TRT: Men who have completed their families or have banked sperm, and want maximum testosterone increase.
The Bottom Line
Options Exist — But Know the Trade-offs
HCG and enclomiphene provide genuine alternatives for men who need testosterone support without sacrificing fertility. Neither achieves the same testosterone levels as direct TRT, but both maintain reproductive function that TRT suppresses. The choice depends on fertility goals, tolerance for injection frequency, and comfort with off-label/compounded medications.