Gonadorelin (GnRH)

FDA Approved

Gonadotropin-Releasing Hormone | GnRH Agonist

Weight: 1,182.3 Da
Half-life: 2-4 minutes
Chain: 10 amino acids
3 studies
2020 latest
Extensively Studied
Dose 100-200 mcg for single injections; 5-20 mcg per pulse for pulsatile therapy
Frequency 2-3 times weekly for fertility/TRT support; every 90-120 minutes for pulsatile therapy; single dose for diagnostic
Cycle Varies - diagnostic single use, fertility therapy ongoing, TRT support continuous
Storage Lyophilized: 2-8°C refrigerated; Reconstituted: 2-8°C refrigerated, use within 14 days due to short stability
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Gonadorelin is a synthetic form of the naturally occurring gonadotropin-releasing hormone (GnRH). It stimulates the pituitary gland to release follicle-stimulating hormone (FSH) and luteinizing hormone (LH), which in turn regulate testosterone production in men and ovulation in women. It is FDA-approved for diagnostic testing and fertility treatment. The pulsatile nature of GnRH secretion is critical for proper reproductive function.

Mechanism of Action

Gonadorelin acts as an agonist of the GnRH receptor in the anterior pituitary. When administered in pulses (mimicking natural secretion patterns every 60-120 minutes), it stimulates release of FSH and LH. LH then stimulates Leydig cells in the testes to produce testosterone, or triggers ovulation in women. Continuous exposure paradoxically causes receptor downregulation and suppressed hormone production.

01 Stimulates natural testosterone production
02 Maintains testicular function during hormone therapy
03 Supports fertility in hypogonadal conditions
04 FDA-approved for diagnostic and therapeutic use
05 Can restore LH and FSH pulsatility
06 Alternative to hCG for testicular stimulation
07 Preserves endogenous hormone production

Molecular Data

Molecular Weight
1,182.3 Da
Chain Length
10 amino acids
Type
Decapeptide
Amino Acid Sequence
One-letter: ?HWSYGLRPG?
H₂N
H
? 1
O ‖ C
N
H 2
O ‖ C
N
W 3
O ‖ C
N
S 4
O ‖ C
N
Y 5
O ‖ C
N
H
G 6
O ‖ C
N
L 7
O ‖ C
N
R 8
O ‖ C
N
P 9
O ‖ C
N
H
G 10
O ‖ C
N
H
? 11
COOH
pGl
1

pGlu

Position 1

His
2

Histidine

Position 2

Trp
3

Tryptophan

Position 3

Ser
4

Serine

Position 4

Tyr
5

Tyrosine

Position 5

Gly
6

Glycine

Position 6

Leu
7

Leucine

Position 7

Arg
8

Arginine

Position 8

Pro
9

Proline

Position 9

Gly
10

Glycine

Position 10

NH2
11

NH2

Position 11

N-terminus C-terminus
Hydrophobic
Polar
Positive (+)
Negative (-)
Modified
Peak 0.0 mcg
Trough 0.0 mcg
SS Peak 0.0 mcg
SS Trough 0.0 mcg

Research Indications

Fertility & Reproductive
Hypogonadotropic Hypogonadism most effective

Treatment of conditions like Kallmann syndrome where GnRH deficiency causes low testosterone and infertility.

Ovulation Induction most effective

Induces ovulation in women with hypothalamic amenorrhea who don't ovulate regularly.

Male Fertility effective

Stimulates testosterone and sperm production by restoring LH/FSH pulsatility.

Delayed Puberty effective

Treatment of delayed puberty due to hypothalamic-pituitary dysfunction.

Diagnostic
Pituitary Function Testing most effective

Used to assess hypothalamic-pituitary function and diagnose GnRH deficiency.

LH/FSH Response Assessment most effective

Evaluates pituitary reserve and responsiveness to GnRH stimulation.

Hormone Optimization
TRT Support effective

Maintains testicular function and fertility during testosterone replacement therapy.

Post-Cycle Therapy moderate

Helps restore natural testosterone production after anabolic steroid use.

Cryptorchidism moderate

Treatment of undescended testes in pediatric patients.

Dosing Protocols

Can be administered as single injections or via pulsatile infusion pump. Single injections are used for diagnostic testing, while pulsatile administration mimics natural GnRH secretion for therapeutic purposes. Very short half-life (10-40 minutes) requires careful dosing strategy.

GoalDoseFrequencyRoute
Diagnostic testing100 mcgSingle injectionSubQ or IV
Fertility support50-100 mcg2-3x weeklySubQ
Pulsatile therapy5-20 mcg per pulseEvery 90-120 minSubQ pump
TRT adjunct100-200 mcg2-3x weeklySubQ

Reconstitution Instructions

Materials Needed:
  • Bacteriostatic water (BAC)
  • Insulin syringes (0.5-1 mL)
  • Alcohol swabs
  • Peptide vial
  • Sterile work surface
  1. 1 Clean work area and hands thoroughly
  2. 2 Calculate required BAC water volume
  3. 3 Draw BAC water into syringe
  4. 4 Inject slowly down vial side (not directly onto powder)
  5. 5 Gently swirl until dissolved (never shake)
  6. 6 Store in refrigerator, use within 14 days

Interactions

+
hCG
Often used as alternative to hCG for testicular stimulation during TRT.
compatible
++
Testosterone
Used alongside TRT to maintain testicular function and fertility.
synergistic
+
Clomiphene
Can be combined in fertility and PCT protocols.
compatible
++
Kisspeptin
Kisspeptin stimulates GnRH release; can work together for hormone optimization.
synergistic

What to Expect

Within minutes
LH and FSH release begins
Hours
Testosterone increase in response to LH
Week 1-2
Improved hormonal markers on blood tests
Week 2-4
Restoration of natural hormone pulsatility
Ongoing
Maintained testicular function and fertility

Side Effects & Safety

Common Side Effects

  • Injection site reactions
  • Headache
  • Flushing
  • Nausea
  • Abdominal discomfort

Stop Signs - Discontinue if:

  • Signs of allergic reaction (rash, difficulty breathing)
  • Severe headaches
  • Unusual abdominal pain

Contraindications

  • Hormone-sensitive tumors
  • Pregnancy
  • Hypersensitivity to GnRH or analogs
  • Conditions worsened by sex hormone release

Quality Checklist

Good Signs

  • White lyophilized powder
  • Clear solution after reconstitution
  • Intact vacuum seal

Warning Signs

  • Slight clumping that dissolves easily

Bad Signs

  • Discolored powder
  • Cloudy or particulate solution
  • Broken seal

References

  • Gonadorelin in Hypogonadotropic Hypogonadism
    Journal of Clinical Endocrinology & Metabolism (2018)

    Pulsatile GnRH administration effectively restores fertility in patients with hypothalamic hypogonadism.

  • GnRH Pulsatility and Reproductive Function
    Frontiers in Endocrinology (2020)

    Pulsatile GnRH secretion (every 60-120 min) is essential for proper FSH/LH release and reproductive function.

  • Gonadorelin for Ovulation Induction
    Fertility and Sterility (2015)

    Effective treatment for ovulation induction in women with hypothalamic amenorrhea.

Related Peptides

hCG compatible

Often used as alternative to hCG for testicular stimulation during TRT.

Kisspeptin synergistic

Kisspeptin stimulates GnRH release; can work together for hormone optimization.

Disclaimer

This information is for educational and research purposes only. Consult a healthcare professional before use.