HMG (Menotropins): Reference Overview and Reconstitution Notes

HMG (Menotropins)

What it is

HMG, short for human menopausal gonadotropin and also called menotropins, is a gonadotropin preparation traditionally extracted and purified from the urine of postmenopausal women. It combines follicle-stimulating hormone (FSH) activity and luteinizing hormone (LH) activity in roughly balanced amounts, and it is a glycoprotein hormone mixture rather than a small synthetic peptide.

Research context and categorization

HMG sits in the reproductive and fertility research category, specifically the study of gonadotropins and the hypothalamic-pituitary-gonadal axis. It is commonly discussed in relation to follicular development and ovarian stimulation, because its FSH component acts on the same receptors as pituitary FSH and its LH component (often supplemented by chorionic gonadotropin activity in purified preparations) acts on the LH receptor. In the published literature it is investigated for controlled ovarian stimulation in assisted reproductive technology cycles and for ovulation induction, and it is also discussed in the context of gonadotropin signaling in male reproductive physiology. As a standardized reference material, each vial is typically expressed in International Units (IU) of FSH and LH activity rather than in milligrams of a single molecule, which distinguishes it from most synthetic research peptides.

Status

  • Regulatory status: FDA-approved as a prescription product for specific indications, including ovulation induction in appropriately selected patients and multiple follicular development within assisted reproductive technology programs. It is not an over-the-counter or freely available research chemical.
  • Sport status: Prohibited under the WADA Prohibited List. Gonadotropins that carry LH or chorionic-gonadotropin-type activity fall under section S2 (peptide hormones, growth factors, related substances and mimetics) and are banned at all times in male athletes because they can stimulate endogenous testosterone production. Because HMG delivers LH-type activity, it is treated within this prohibited class.

Reconstitution notes (general)

For a lyophilized (freeze-dried) powder, concentration equals the amount in the vial divided by the volume of liquid added: milligrams in the vial divided by millilitres of bacteriostatic water added. HMG is unusual in that its potency is stated in International Units (IU) of FSH and LH activity rather than in milligrams, so its "concentration" is expressed as IU per millilitre. As a worked example, a 75 IU vial reconstituted with 1 mL of diluent gives 75 IU/mL, while the same vial in 3 mL gives 25 IU/mL. To calculate concentration for a given fill and volume, use the calculator at our reconstitution and blend calculators.

Dilution and handling notes (compound-specific)

HMG is supplied as a white lyophilized powder in a vial that is reconstituted before use, so it does behave like other freeze-dried reference materials in that respect. A key difference is the diluent: commercial menotropin products are paired with a small volume of sterile sodium chloride (saline) solution, typically around 1 mL added per vial from a 2 mL diluent supply, rather than bacteriostatic water. The powder is formulated to dissolve quickly and clearly, and it generally goes into solution almost immediately rather than gelling, clouding, or forming a precipitate the way some highly concentrated peptides can. Because it is a protein-based hormone, it should be handled gently: aim the diluent down the inner wall of the vial and swirl slowly rather than shaking hard, since vigorous shaking can foam and denature the protein. A practical quirk of this product family is that multiple powder vials are often pooled into a single small volume of diluent, drawing the reconstituted mixture from one vial and injecting it into the next powder vial so several vials combine into roughly 1 mL. Properly reconstituted HMG is a clear, colorless solution with no visible particles, and many menotropins presentations are intended for prompt use after mixing rather than long storage, so any hold time should follow the specific product's labeling.

Handling and storage

Keep vials refrigerated at roughly 2 to 8 degrees Celsius and out of direct light. Wipe the rubber stopper with an alcohol swab before drawing diluent or withdrawing solution, and label the vial with the date it was mixed. As a general reference for reconstituted lyophilized material, a refrigerated window of about four weeks is often cited, though protein gonadotropin preparations are frequently intended for prompt use, so follow the shortest applicable guidance. Discard any solution that looks cloudy, discolored, or shows visible particles or floaters.

Related reading

Tools and supplies

For laboratory and research reference only. Educational content, not medical, dosing, injection, or therapeutic guidance, and not intended for human or animal use. Any research uses described are investigational and not confirmed or approved benefits. Confirm anything involving health with a licensed professional. References linked above.