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Peptide Library / Hormone / Sexual Health

Gonadorelin

GnRH (1-10)

Gonadorelin Research Protocol

Complete Research Guide 4 min read1 peer-reviewed references

Quickstart Overview

Gonadorelin is synthetic GnRH (the native gonadotropin-releasing hormone decapeptide). Delivered in a pulsatile manner it stimulates the pituitary to secrete LH and FSH, supporting testicular function and fertility — commonly used to maintain the HPG axis during testosterone therapy.

Reconstitution
Add 2.0 mL bacteriostatic water to a 2–5 mg vial
Literature Range
100–200 mcg per administration
Measuring Reference
At 2.5 mg/mL: 100 mcg = 0.04 mL = 4 units
Frequency
Pulsatile, 2–3×/week or more
Route (studies)
Subcutaneous
Target
GnRH receptor

Scientific Data

Molecular Formula
—
Molecular Weight
1182.3 Da
Sequence
pGlu-His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly-NH2
Sequence Length
33
CAS
Research compound
Peptide Family
GnRH analog
Half-life
Refer to published literature
Solubility
Bacteriostatic water, sterile saline
Storage
Lyophilized: -20°C. Reconstituted: 2–8°C, use within 2–4 weeks.
Appearance
White lyophilized powder
Standard: 5 mg vial · 2 mL diluent

Dosing & Reconstitution Guide

Interactive Reconstitution
Adjust vial size, diluent and target dose. Results update live.
Full Precision Calculator →
Concentration
2.50 mg/mL
Draw Volume
0.040 mL
Syringe Units
4.0 U
Doses / Vial
50

Units assume a U-100 insulin syringe (100 units = 1 mL). Must be dosed pulsatile — continuous exposure down-regulates the pituitary.

Frequency: Pulsatile (2–3×/week+)

Reconstitution Steps

  1. 1Allow the lyophilized vial and bacteriostatic water to reach room temperature (~15 min).
  2. 2Swab both vial stoppers with a fresh 70% isopropyl alcohol pad and let them dry.
  3. 3Draw 2.0 mL of bacteriostatic water into a mixing syringe.
  4. 4Insert at an angle and let the water run slowly down the glass wall — never directly onto the powder.
  5. 5Gently swirl (do not shake) until the solution is completely clear.
  6. 6Label with date and concentration (mg/mL) and refrigerate at 2–8 °C immediately.

Supplies Needed

Planning example for a 8-week protocol at approximately 100 mcg per day.

Peptide (5 mg vials)
Estimate vials from total mass: 100 mcg/day × 56 days.
Bacteriostatic Water
One 10–30 mL vial typically covers a full cycle.
Insulin Syringes (U-100)
One per administration (29–31 G, 0.3–0.5 mL).
Alcohol Swabs
Two per administration (vial + site).
Sharps Container
Required for safe disposal.

Protocol Overview

Goal
Model pulsatile GnRH stimulation of LH/FSH.
Schedule
Pulsatile, ongoing/blocks.
Dose Range
100–200 mcg/dose.

Dosing Protocol

Standard
100–200 mcg 2–3× weekly (TRT support) or EOD
Frequency
Pulsatile — every 2–3 days or more often
Target
Per protocol
Cycle Length
Ongoing with TRT or in blocks
Timing
Pulsatile dosing is essential
Route
Subcutaneous

Storage Instructions

Lyophilized
−20 °C long term (18–24 months); stable at room temperature for short transit.
Reconstituted
2–8 °C refrigerated; use within 4 weeks.
Light
Protect from direct light; keep in the original carton.
Freeze/Thaw
Avoid repeat freeze–thaw cycles after reconstitution.

Important Notes

  • Pulsatile dosing is mandatory — continuous use suppresses rather than stimulates.
  • Short half-life requires frequent administration.

How This Works

Gonadorelin binds pituitary GnRH receptors to trigger LH and FSH release, which drive testicular testosterone production and spermatogenesis (or ovarian function). The key is pulsatile administration: brief pulses mimic natural hypothalamic rhythm and stimulate the pituitary, whereas continuous exposure paradoxically down-regulates it. It is widely used to prevent testicular atrophy and preserve fertility on TRT.

Potential Benefits & Side Effects

Reported in research
  • Stimulated LH/FSH release and testicular function
  • Preservation of fertility and testicular size on TRT
  • Physiological, short-acting HPG-axis support
  • Diagnostic use for pituitary function
Possible considerations
  • Injection-site reactions
  • Short half-life (frequent dosing)
  • Down-regulation if dosed continuously (must be pulsatile)
  • Headache or flushing

Lifestyle Factors

  • Adequate hydration and 7–9 h of sleep are standard controls in most research protocols.
  • Consistent dose timing improves the reliability of any self-tracked endpoints.
  • Maintain a clean, sterile workflow for every draw to avoid contamination.

Injection Technique

  1. 1Wash hands, then prep the vial top and the target site with separate alcohol swabs.
  2. 2Pinch a subcutaneous skin fold (abdomen, ~2 inches from the navel) and insert at 45–90°.
  3. 3Depress the plunger slowly over 3–5 seconds, hold 5 seconds, then withdraw.
  4. 4Rotate sites each administration and dispose of the syringe in a sharps container.

Frequently Asked Questions

Third-party HPLC testing

CG Labz Verified Batches

No published batches yet.

Research Disclaimer

All compounds are supplied strictly for laboratory research. Dosing figures below summarize ranges reported in published preclinical and clinical literature for reference purposes only. CG Labz does not provide medical advice or individualized dosing recommendations.

Peer-reviewed literature

References

  1. [1] Journal of Clinical Endocrinology & Metabolism
    Pulsatile GnRH (gonadorelin) and gonadotropin secretion.
    View Source