What is the difference between Cetrorelix and LH?

Cetrorelix: Competitive GnRH receptor antagonist; immediately blocks pituitary GnRH receptors; rapidly suppresses LH/FSH without initial flare effect; used for controlled hormonal suppression LH: Binds LH receptors on testicular Leydig cells, stimulating the cholesterol → testosterone biosynthetic pathway. In women, the LH surge triggers ovulation and supports luteal phase progesterone production.

Is Cetrorelix FDA approved?

Cetrorelix is FDA approved. This regulatory status is provided for research and educational context only.

LH is FDA approved (FDA status current as of 2004-10-08). This regulatory status is provided for research and educational context only.

How is Cetrorelix administered in research settings?

In research settings, Cetrorelix is typically administered via the subcutaneous route. PeptideBase does not provide dosing or administration instructions.

How is LH administered in research settings?

In research settings, LH is typically administered via the subcutaneous or intramuscular routes. PeptideBase does not provide dosing or administration instructions.

Home›Research›Compare›Cetrorelix vs LH

Peptide Comparison

Cetrorelix vs LH

Both are Reproductive & Hormonal peptides.

Cetrorelix

Cetrotide

Sexual HealthFDA ApprovedPrescription

Half-life: ~62 hours

1 providers listed

Full Cetrorelix profile →

LH

Luteinizing Hormone

Sexual HealthFDA ApprovedResearch Only

No providers listed yet

Full LH profile →

Bottom line

Cetrorelix carries stronger published evidence (Meta-analysis, 7 key studies) than LH (RCT, 6); both are research compounds.

Quick Verdict

Cetrorelix

Half-life

~62 hours

Half-life

—

Which One Should You Choose?

Your goal	Better option
Stronger clinical evidence	Cetrorelix
More provider options (1 vs 0)	Cetrorelix

Research summary only — not medical advice. Consult a qualified provider before making any decisions.

Side-by-Side Comparison

Cetrorelix

Mechanism Family

Reproductive & Hormonal

Half-life

~62 hours

—

FDA Status

approved

Admin Routes

subcutaneous

subcutaneous, intramuscular

Availability

Prescription

Research Only

Providers

1 listed

None listed

FDA Update

—

Oct 2004

Avail. Notes

FDA-approved GnRH antagonist. Brand: Cetrotide (NDA 021036, Jun 1999). Prevents premature LH surges in controlled ovarian stimulation. Prescription only.

—

Research Evidence

Cetrorelix

Meta-analysis · 7 key studies · most recent 2026

RCT · 6 key studies · most recent 2026

Research Citations

Cetrorelix

Meta-analysis2026 · J Coll Physicians Surg Pak

GnRH Agonists and Antagonists in IVF/ICSI Cycles of PCOS Women: A Network Meta-Analysis.

Meta-analysis2023 · Hum Reprod Update

Optimal GnRH antagonist protocol for ovarian stimulation during ART: systematic review and network meta-analy…

Cohort2026 · Int J Reprod Biomed

Efficacy and safety of different cetrorelix doses in the luteal phase for preventing ovarian hyperstimulation…

Cohort2021 · BMC Pregnancy and Childbirth

Effects of half-dose and full-dose GnRH antagonists on IVF-ET outcomes: a retrospective study

+3 more

RCT2005 · Human Reproduction

The use of recombinant human LH (lutropin alfa) in the late stimulation phase of assisted reproduction cycles…

Cohort2026 · Exp Clin Endocrinol Diabetes

Recovery of gonadal axis in patients with prolactinomas.

Animal2026 · J Neuroendocrinol

Pulsatile LH release in male and female Sprague Dawley and Wistar rats in different reproductive states.

Animal2026 · Genetics

Functional Landscape of Zebrafish Gonadotropins and Receptors: A Comprehensive Genetic Analysis.

+2 more

About Cetrorelix

Competitive GnRH receptor antagonist; immediately blocks pituitary GnRH receptors; rapidly suppresses LH/FSH without initial flare effect; used for controlled hormonal suppression

Research Areas

HPG axis suppressionLH/FSH reductioncontrolled ovarian stimulation supporttestosterone management

About LH

Binds LH receptors on testicular Leydig cells, stimulating the cholesterol → testosterone biosynthetic pathway. In women, the LH surge triggers ovulation and supports luteal phase progesterone production.

Research Areas

testosterone stimulationfertility supportHPG axis supportovulation inductionLeydig cell activation

Safety Profile

Information below reflects published research data only — not medical advice. Consult a qualified provider before use.

Cetrorelix

Absolute Contraindications

Pregnancy — contraindicatedLactation — contraindicated

Source: FDA label

Suggested Monitoring

Under clinical review

Being verified by our medical team before we display monitoring guidance for this peptide.

Absolute Contraindications

Under clinical review

Being verified by our medical team before we display contraindications for this peptide.

Suggested Monitoring

Under clinical review

Being verified by our medical team before we display monitoring guidance for this peptide.

Find Providers

Where to source these peptides

Providers offering

Cetrorelix

1 listed

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Providers offering

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PeptideBase lists providers for educational research purposes only. Always consult a qualified healthcare professional before obtaining or using any peptide.

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Educational research tools — not medical advice.