Gonadorelin vs Somatropin (HGH)
Side-by-side comparison of key properties, dosing, and research.
Sexual Health & LibidoAnti-Aging & Longevity
GonadorelinGrowth Hormone PeptidesAnti-Aging & Longevity
Somatropin (HGH)- Summary
- Gonadorelin is the synthetic form of endogenous GnRH (gonadotropin-releasing hormone). It stimulates the pituitary to release LH and FSH, maintaining testicular function and testosterone production. Widely used alongside TRT to prevent testicular atrophy and preserve fertility.
- Somatropin is recombinant human growth hormone (rhGH), identical in structure to the 191-amino acid pituitary-derived growth hormone. It is FDA-approved for growth hormone deficiency, short stature, and wasting conditions. Off-label, it is widely explored for body composition, anti-aging, and performance enhancement, though significant risks accompany unsupervised use.
- Half-Life
- ~2–4 minutes (extremely short); pulsatile dosing required to avoid desensitization
- 2-3 hours (subcutaneous); 20-30 minutes (intravenous)
- Admin Route
- SubQ, Intranasal
- Subcutaneous, Intramuscular (less common)
- Research
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- Typical Dose
- 100 mcg
- 0.15-0.3 mg/day (adults); titrated to IGF-1 levels
- Frequency
- Twice daily (every 12 hours)
- Once daily
- Key Benefits
- Maintains testicular size during TRT
- Preserves fertility and sperm production during testosterone use
- Stimulates endogenous LH/FSH production
- Maintains HPG axis function during exogenous hormone use
- Used for HCG-free TRT protocols
- Helps restart natural testosterone production (PCT)
- Increases lean muscle mass and reduces body fat (particularly visceral)
- Restores growth hormone deficiency (FDA-approved)
- Improves bone mineral density
- Enhances exercise capacity and recovery
- Supports skin thickness and collagen synthesis
- Improves lipid profile in GHD patients
- Explored for anti-aging and cellular regeneration
- Side Effects
- Injection site reactions
- Headache
- Nausea at initiation
- Tachycardia (rare)
- +1 more
- Fluid retention and edema (common, dose-dependent)
- Carpal tunnel syndrome
- Joint and muscle pain
- Insulin resistance and elevated blood glucose
- +3 more
- Stacks With
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