HCG
$Approved fertility/endocrine drug with established medical uses
hCG is an LH-like hormone used medically in fertility and endocrine care. In men, it can stimulate Leydig cells to produce testosterone. In women, it can trigger ovulation in supervised protocols.
Unlike many entries, hCG has legitimate approved medical uses. The danger is not lack of biology. The danger is unsupervised endocrine manipulation, fertility complications, gynecomastia, testicular axis suppression/rebound issues, and pregnancy-related risks. Understand that blood levels reaching steady state in days is not the same as fertility response.
Monitor the hypothalamic-pituitary-gonadal axis, estradiol, semen parameters where relevant, and pregnancy or ovarian risks under clinician oversight.
Classification details
- hCG is a naturally occurring glycoprotein hormone produced by the syncytiotrophoblast cells of the placenta during pregnancy.
- In a research and clinical context, it is derived from either the urine of pregnant women or manufactured via recombinant DNA technology.
- It is classified as a gonadotropin and acts as a biological “mimic” of Luteinizing Hormone (LH).
- hCG is a glycoprotein hormone with LH-like activity, not a small synthetic peptide. Its relevance is fertility, testicular steroidogenesis, and specific endocrine indications.
hCG shares an identical alpha subunit with Luteinizing Hormone (LH) and a very similar beta subunit, allowing it to bind to the same receptors:
- Testicular Activation: It binds to the LH/hCG receptors on the Leydig cells of the testes. This triggers the conversion of cholesterol into pregnenolone, ultimately stimulating the endogenous production of testosterone.
- Ovarian Stimulation: In females, it triggers ovulation and supports the corpus luteum for progesterone production.
- Bypassing the Pituitary: hCG acts directly on the gonads. It provides a signal for hormone production even when the pituitary gland is suppressed (e.g., during HRT, TRT, or anabolic use).
- Intratesticular Testosterone (ITT): Crucially, hCG maintains high levels of ITT, which is essential for spermatogenesis (sperm production) and preventing testicular atrophy.
- hCG activates LH receptors, stimulating Leydig-cell testosterone production and supporting ovarian processes depending on sex and context. It can raise testosterone and estradiol downstream.