Human Growth Hormone (HGH) vs Mod GRF 1-29
A detailed comparison to help you understand the differences and choose the right peptide for your research goals.
Human Growth Hormone (HGH)
Human Growth Hormone (somatropin) is a 191-amino acid protein identical to naturally produced GH. FDA-approved for growth hormone deficiency, Turner syndrome, and other conditions. Widely used off-label for anti-aging and performance.
Full details →Mod GRF 1-29
Mod GRF 1-29 (Modified GRF 1-29, also called CJC-1295 without DAC or Tetrasubstituted GRF 1-29) is a modified growth hormone-releasing hormone analog with improved stability over natural GHRH.
Full details →Side-by-Side Comparison
| Aspect | Human Growth Hormone (HGH) | Mod GRF 1-29 |
|---|---|---|
| Dose Range | 200 mcg–2 mg | 100 mcg–200 mcg |
| Frequency | 1x daily | 3x daily |
| Cycle Length | 12–24 weeks | 8–12 weeks |
| Route | subcutaneous | subcutaneous |
| Mechanism | Binds to GH receptors throughout the body, stimulating IGF-1 production in the liver. Promotes protein synthesis, fat metabolism, and cellular regeneration across multiple tissues. | Binds to GHRH receptors in the pituitary gland to stimulate growth hormone release. Four amino acid substitutions improve resistance to enzymatic degradation while maintaining biological activity. |
| Typical Dosage | Medical: 0.1-0.3mg/kg/week divided into daily doses. Anti-aging: 1-2 IU daily. Performance: 2-6 IU daily, sometimes higher. | Typical dosing: 100-300mcg administered 2-3 times daily, usually combined with a GHRP like Ipamorelin for synergistic effects. |
| Administration | Subcutaneous injection, preferably at night to mimic natural pulsatile release. Rotate injection sites. Store refrigerated. | Subcutaneous injection. Best administered on empty stomach. Short half-life (~30 minutes) necessitates multiple daily doses, unlike DAC version. |
| Side Effects | Joint pain, water retention, carpal tunnel syndrome, potential insulin resistance, and acromegaly features with long-term high doses. | Flushing, headache, dizziness, and injection site reactions. Generally well-tolerated. May cause water retention. |
| Best For |
What They Have in Common
Human Growth Hormone (HGH), Mod GRF 1-29 are both commonly used for:
Key Differences
Unique to Human Growth Hormone (HGH):
Which Has Stronger Evidence?
- Fat Loss: Human Growth Hormone (HGH) has stronger research support.
- Recovery & Healing: Human Growth Hormone (HGH) has stronger research support.
| Goal | Human Growth Hormone (HGH) | Mod GRF 1-29 |
|---|---|---|
| Muscle Growth | high | high |
| Fat Loss | high | medium |
| Recovery & Healing | high | medium |
| Sleep Quality | medium | medium |
Key Studies
Human Growth Hormone (HGH)
- Transgenic Artifacts Caused by Passenger Human Growth Hormone.
Trends in endocrinology and metabolism: TEM, 2018
- [Human growth hormone and Turner syndrome].
Anales de pediatria (Barcelona, Spain : 2003), 2017
- Significance of the disulphide bonds of human growth hormone.
Endokrynologia Polska, 2013
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