Supplement Scholar
GnRH Antagonist

Ganirelix

Research compound. This is not a dietary supplement. Unless it is identified as an approved prescription drug, it is not approved by the FDA for human use. This page summarizes published research for education only; we do not sell it or link to sellers.

Ganirelix. Another GnRH antagonist used to suppress the LH surge in assisted reproduction.

How it works. Competitively antagonizes pituitary GnRH receptors, rapidly suppressing LH and FSH without an initial flare.

What the research supports. 2 graded claims. Strongest: Pre-filled syringe convenience (preclinical).

Hormonal impact. Effects on LH, FSH.

Side effects and interactions. 0 medication interactions listed. Serious: Hypersensitivity reactions reported.

Stacking. Pairs well with Recombinant FSH protocols. Avoid combining with Latex allergy with older syringe formulations.

Common forms. Available as Subcutaneous injection (pre-filled syringe).

Community. Experiences from people who have tried Ganirelix. Anecdotes are not medical advice.

Ganirelix. Another GnRH antagonist used to suppress the LH surge in assisted reproduction.

Molecular structureC80H113ClN18O13 · 1570.3 g/mol

What it is

Ganirelix is a synthetic decapeptide GnRH receptor antagonist used in assisted reproduction protocols.

Also called

AntagonOrgalutran

How it works

Competitively antagonizes pituitary GnRH receptors, rapidly suppressing LH and FSH without an initial flare.

Pathways

  • GnRH receptor antagonism
  • LH and FSH suppression

Effects

  • ⊘Premature LH surge during ovarian stimulation inhibits

What the research supports

Pre-filled syringe conveniencepreclinical
No flare phasepreclinical

Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.

Hormonal impact

↓LHdecreases
↓FSHdecreases

Side effects & interactions

Common side effects

  • Injection-site reaction
  • Mild headache

Serious

  • Hypersensitivity reactions reported

No notable medication interactions listed.

Check any supplement–medication combination with your pharmacist before starting.

Combines with

Pairs well

  • Recombinant FSH protocolsStandard component of antagonist IVF cycles.

Avoid combining

  • Latex allergy with older syringe formulationsCheck product insert for current formulation.

Common forms

  • Subcutaneous injection (pre-filled syringe)

Discussion

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