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HCG

Human Chorionic Gonadotropin Pregnyl Novarel

None

Technical catalog description

HCG is a glycoprotein hormone that mimics LH (luteinizing hormone) at the pituitary-testicular axis level. It directly stimulates Leydig cells in the testes to produce testosterone, maintaining testicular size and intratesticular testosterone during anabolic steroid cycles when endogenous LH is suppressed.

It is used in two distinct contexts: on-cycle maintenance (small doses 2–3 × weekly to prevent testicular atrophy and maintain fertility potential) and as part of PCT (higher doses to jumpstart Leydig cell function before SERM therapy). It is also used in fertility protocols and in TRT optimization for men who want to maintain testicular function while on exogenous testosterone.

Overview Use context Comparison Safety
Warning
Very high continuous doses can desensitize Leydig cells and worsen recovery · Increases estrogen via aromatization in the testes, so an aromatase inhibitor may be needed at higher doses · Should not substitute for proper PCT when cycle ends

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Overview

HCG is one of the most practically important ancillary compounds in the AAS world, yet it is also one of the most misunderstood. The core function is simple: when exogenous androgens suppress the HPG axis, LH drops, and the testes stop being stimulated. HCG replaces that LH signal.

This catalog does not validate an on-cycle maintenance amount, injection frequency, or transition to a PCT regimen.

In PCT, HCG is used as a bridge: it primes the Leydig cells before the SERM phase, improving the speed and quality of natural testosterone recovery. The sequence is HCG first, then SERM, not both simultaneously in the early phase.

Safety & monitoring
Side effects

  • Estrogen elevation from testicular aromatization can require AI adjustment

  • Acne flares, water retention, and mood fluctuation if estrogen is not managed

Monitoring

  • LH and FSH (to confirm suppression and recovery)

  • Total and free testosterone

  • estradiol (E2), since HCG stimulates testicular aromatization

Avoid if

  • Using it as a replacement for, not a bridge to, natural testosterone recovery

  • Continuous high-dose use without monitoring estrogen

Use context

Unverified community-use description: HCG is discussed alongside AAS and TRT. Those accounts do not establish a fertility-preservation or post-cycle regimen.

Timeline & expectations

Testicular size responses to on-cycle HCG are visible within a few weeks. Recovery of Leydig function during PCT priming is the goal, not immediate testosterone normalization. That comes later through the SERM phase after the HCG bridge.

Notes

Source reference information

Community reference · IU per administration. The source example does not establish individualized fertility treatment or a product-specific route. References remain separate from quantities entered in a plan.

Starting: 250 IU/administration. Every other day. Wiki reports an on-cycle hCG reference. Population: Steroid users in the community first-cycle example. Route: unspecified in this claim; formulation: unspecified in this claim. No IU-to-mg conversion. Exact injection route, product, indication and individual fertility goals are not established by this sentence. Source: r/steroids: Your First Cycle.

Common mistakes

Applying a fixed sequence of HCG and SERMs without product- and indication-specific instructions. No such sequence is validated by this profile.

Comparison notes

Compared with HMG, HCG replaces only LH activity. HMG provides both FSH and LH analog activity, making it superior for fertility restoration when FSH is the limiting factor. Compared with Kisspeptin or Clomiphene PCT, HCG addresses the testicular side of the HPG axis directly rather than working upstream through the pituitary.

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