Reproductive

HCG (Human Chorionic Gonadotropin)

Also known as Human Chorionic Gonadotropin, Pregnyl, Novarel, Ovidrel

HCG mimics the hormone LH to switch the testes back on, raising natural testosterone and supporting fertility. Also used clinically in fertility treatment.

One-dose burn-down
Half-life
36 h
Range
33 h–39 h
Tmax
20 h
Bioavailability
45%
Steady state
~7d
Typical dose
500 IU

Gonadotropin that mimics LH to stimulate testicular testosterone production. Used clinically for fertility and (off-label) to maintain testicular function and fertility on TRT.

Mechanism of action

Binds LH receptors on testicular Leydig cells, stimulating endogenous testosterone and intratesticular signaling.

Prescription hormone, dosed in international units (IU). TRT-maintenance doses (~250–500 IU a few times weekly) are far lower than IVF trigger doses (5,000–10,000 IU).

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Subcutaneous PK (PMC)

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