HCG

HCG - human chorionic gonadotropin - is a glycoprotein hormone that binds the luteinising hormone receptor. In males, that receptor sits on Leydig cells in the testes, and activating it drives testosterone production directly at the source. That single mechanism explains everything HCG is studied for: testicular function, fertility support and recovery of the hormonal axis.

Luteinising hormone is the pituitary signal that tells the testes to make testosterone. HCG is structurally similar enough to bind the same receptor, but it has a much longer half-life, which is why it produces a sustained rather than pulsatile signal.

The consequence is that HCG substitutes for LH at the testis while the pituitary's own output is suppressed. That is useful when the goal is to keep testicular function active, and it is why HCG appears in recovery protocols after suppressive compounds.

Testicular Function and Recovery

During suppression, the testes receive little or no LH signal, and both volume and function decline. HCG restores the signal without waiting for the pituitary to recover on its own.

This is a mechanistic intervention, not a cure-all. HCG does not restore the pituitary's own output, and stopping it returns the system to its previous state unless the axis has recovered independently.

Fertility

Spermatogenesis requires both LH-like and FSH-like signalling. HCG provides the first; fertility protocols often pair it with an FSH source. On its own, HCG supports the Leydig cell side of the picture.

That distinction matters when reading claims. HCG is studied for fertility support, but it is not a complete fertility treatment, and outcomes depend on the cause of the impairment.

Vial Sizes and Reconstitution

HCG is supplied as a lyophilised powder with a separate diluent, usually in 5,000 IU or 10,000 IU vials. Reconstitute by adding the diluent slowly down the vial wall, then swirl gently; do not shake, because the glycoprotein is fragile.

Once reconstituted, store at 2-8°C and use within the window stated on the label. Bacteriostatic water is preferred over plain sterile water for multi-use vials because the preservative limits bacterial growth.

Dosing and Measurement

Doses are expressed in international units, not milligrams, and the concentration depends entirely on how much diluent is added. A 5,000 IU vial reconstituted with 5 ml gives 1,000 IU per millilitre; the same vial with 2 ml gives 2,500 IU per millilitre.

That arithmetic is the most common source of error with HCG. Write the concentration on the vial after mixing.

What to Compare Here

Listings state the IU strength, vial count and live stock. The 10,000 IU presentation suits protocols needing larger total amounts; the 5,000 IU vial allows a shorter reconstituted life. Open the product page for the full specification and buying details.