Somatropin (HGH) (Recombinant Human Growth Hormone)
Biosynthetic human growth hormone identical to the 191-amino-acid pituitary-derived hormone. Stimulates linear growth, protein synthesis, lipolysis, and organ growth. Widely used in anti-aging, body composition, and recovery research.
How it works
Binds to GH receptors on target cells, triggering the JAK2/STAT5 signaling pathway. Stimulates hepatic IGF-1 production, promotes protein synthesis, mobilizes fatty acids from adipose tissue, and increases glucose output.
Key facts
- Molecular weight: 22,124 Da
- Half-life: 2-3 hours (subcutaneous); tissue effects persist 9-17 hours via IGF-1
- Bioavailability: ~80% subcutaneous
- Storage: Refrigerated at 2-8C. Do not freeze. Reconstituted vials use within 14-21 days.
Dosing overview
- Typical dose: 1-4 IU/day (anti-aging/wellness); 4-8 IU/day (performance)
- Frequency: Daily (split AM/PM for higher doses)
- Duration: 3-6 months minimum for full benefits
- Route: Subcutaneous injection
Protocol notes
- Anti-aging: 1-2 IU daily, AM injection on empty stomach.
- Body composition: 2-4 IU daily, split AM and post-workout or pre-bed.
- Performance: 4-8 IU split into 2-3 injections daily.
- Start low and titrate up over 2-4 weeks to minimize side effects.
Reported benefits
- Fat loss (especially visceral)
- Increased lean muscle mass
- Improved sleep quality
- Faster recovery from injury
- Improved skin elasticity
- Increased bone density
- Enhanced cognitive function
Possible side effects
- Water retention and joint pain
- Carpal tunnel syndrome
- Insulin resistance
- Potential for acromegaly features at high doses
- Numbness/tingling in extremities
Research
- Effects of GH on body composition in adults (2009): Meta-analysis showed GH therapy reduced body fat by 2.6 kg and increased lean mass by 2.1 kg over 6-12 months.
- GH replacement and cardiovascular risk (2012): 10-year follow-up showed GH replacement improved lipid profiles and reduced cardiovascular mortality in GH-deficient adults.
- Growth hormone and aging (2019): Low-dose GH in elderly subjects improved body composition, bone density, and quality of life markers over 2 years.
Community reviews of Somatropin (HGH)
- recon_math_ray rated it 5/5 - Sleep quality improvement was the first thing I noticed: Running Somatropin (HGH) for 6 weeks now, primarily for recovery and body composition. The first benefit I noticed was dramatically better sleep, deeper and more restorative, within the first week. Body composition changes came slower but are real. Leaner midsection, slightly fuller muscles, and my recovery between training sessions is noticeably improved. Not dramatic bodybuilder gains, more like everything works a bit better. Side effects have been minimal. Some water retention in the first 2 weeks that settled down, and occasional numbness in my fingers in the morning that goes away withi
- wellness_wade rated it 5/5 - Body comp changes subtle but real: About 6 months into my Somatropin (HGH) protocol and the compound is doing what it is supposed to. Sleep is deeper, skin quality is better, fat around the midsection is slowly reducing, and my recovery from training is improved. The key insight I have learned is patience. This is not an overnight transformation. It is a slow, steady optimization that compounds over weeks and months. People who quit after 2 weeks are not giving it enough time. Only downsides: some mild joint stiffness early on (actually a sign it is working) and the fasted dosing schedule is sometimes inconvenient. Worth it f
- cycle_sage rated it 4/5 - Better recovery and deeper sleep at 6 months: Somatropin (HGH) has been a solid addition to my protocol. The GH release translates to better sleep, improved recovery, and a gradual improvement in body composition that I did not get from training alone. I track my sleep with a wearable and my deep sleep percentage went from 12% to about 18-20% within the first two weeks. That alone is worth it for recovery. The body comp changes are more subtle but visible in progress photos over 2-3 months. No significant side effects at the doses I am running. Occasionally wake up with slightly puffy hands but it resolves within an hour. Recommend star
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Research and educational reference only. Not medical advice.