HMG (Human Menopausal Gonadotropin), also known as menotropins, is a gonadotropin preparation containing both Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH) activity. Traditionally, HMG is purified from the urine of postmenopausal women. Modern highly purified HMG preparations commonly provide approximately a 1:1 ratio of FSH to LH activity.

HMG is particularly important in reproductive research because FSH and LH are two of the principal hormones controlling ovarian follicle development, ovulation, testosterone production and spermatogenesis.

Key Research Areas

Male Fertility & Spermatogenesis
HMG has been investigated for its ability to stimulate sperm production, particularly in males with inadequate endogenous gonadotropin signalling. FSH acts primarily on Sertoli cells and supports spermatogenesis, while LH activity supports Leydig-cell testosterone production. Clinical literature describes HMG use, generally alongside hCG, in men with hypogonadotropic hypogonadism.

Female Fertility & Follicular Development
HMG has an established role in reproductive medicine for stimulating ovarian follicles. FSH promotes follicular recruitment and development, while LH activity contributes to ovarian steroid production and follicular maturation.

Assisted Reproductive Technology (ART)
Menotropins have been extensively investigated and clinically used in IVF and other assisted-reproduction protocols. An FDA-licensed menotropins product is available specifically for ovarian stimulation as part of assisted reproductive technology.

Hypothalamic-Pituitary-Gonadal Axis Research
Because HMG provides external FSH and LH activity, it is useful for studying the hypothalamic-pituitary-gonadal (HPG) axis, including gonadal responses when endogenous pituitary gonadotropin production is inadequate.

How HMG Works

HMG essentially provides two complementary gonadotropin activities:

FSH → Follicular/Sertoli-cell stimulation

LH activity → Ovarian steroidogenesis/Leydig-cell stimulation

In females, these pathways contribute to follicular development and estrogen production.

In males, FSH supports Sertoli-cell function and spermatogenesis, while LH-like activity stimulates Leydig cells and supports intratesticular testosterone production.

HMG vs HCG

Although HMG and HCG are frequently discussed together, they have different functions.

HMG primarily provides FSH plus LH-like activity, giving it a direct role in follicular development and spermatogenesis.

HCG predominantly mimics LH activity through the LH/CG receptor. In male fertility protocols, HCG may therefore provide Leydig-cell stimulation while HMG contributes the additional FSH activity required to directly support spermatogenesis.