Human Growth Hormone (Somatropin) — Dosing, Cycles, Half-Life & Side Effects
Human Growth Hormone (Somatropin) is a recombinant growth hormone with a half-life of 2-3 hours. Recombinant human growth hormone identical to endogenous GH. FDA-approved for GH deficiency and other conditions. The gold standard for GH-based therapy with extensive safety and efficacy data. This page is educational harm-reduction reference compiled from peer-reviewed literature — not medical advice, not an endorsement, not a recommendation to use. Consult a licensed clinician before any decision.
Quick Facts
| Class | Growth Hormone |
|---|---|
| Half-life | 2-3 hours |
| Detection window | 1 days |
| Hepatotoxicity | None |
| Suppression | 0/10 |
| Administration | subcutaneous |
Typical Dosing Ranges
Common dose range: 2-4 IU/day for anti-aging, 4-8 IU/day for body composition
Cycle length: 16-52 weeks (minimum 16 weeks for results)
Time to steady state: ~0.5 days
Dose ranges are compiled from published pharmacokinetic studies and community-reported usage. Where a value is community-reported rather than clinically studied, this page and its structured data flag it. Lower end of any range is always the safer starting point.
Stacking Considerations
- No structural stacking blockers. Standard harm-reduction rules apply: minimize total androgen load, minimize oral exposure, and monitor bloodwork.
PCT Requirements
- Depot clearance estimate: ~1 days post-last-dose before SERM start (5 × apparent depot half-life of 3h).
- Never stack two SERMs. Extend a single SERM (tamoxifen OR enclomiphene/clomiphene) rather than combining.
- Use the cycle planner to generate a full protocol based on your complete stack, not this compound alone.
Side Effect Profile
- Very expensive ($300-1000+/month)
- Requires daily injections
- Commonly counterfeited
- Can cause insulin resistance
- Water retention and joint pain possible
- Potential for organ growth with abuse
Known Interactions
No compound-specific interactions are catalogued in the current matrix. This does not mean no risk exists — it means there is no curated pairwise entry. Browse the full interaction matrix to cross-reference manually.
Related compounds
Monitoring (Bloodwork & Vitals)
- Comprehensive metabolic panel (baseline, mid-cycle, post-cycle)
- Lipid panel (total cholesterol, HDL, LDL, triglycerides)
- CBC (hemoglobin, hematocrit — watch for erythrocytosis)
- Sex-hormone panel (Total T, Free T, Estradiol sensitive, SHBG, LH, FSH)
- Blood pressure (weekly self-check; flag systolic >140 or diastolic >90)
Baseline bloodwork is recommended before any cycle. Discontinue if liver enzymes exceed 3× upper limit of normal or if hematocrit exceeds 54%.
Frequently Asked Questions
What is the half-life of Human Growth Hormone (Somatropin)?
Human Growth Hormone (Somatropin) has a half-life of approximately 2-3 hours. Clearance estimate: 3h × 5 = 15h = 0.5 days. This figure is used to determine injection frequency (for esters) and post-cycle clearance timing.
What is the typical dose range for Human Growth Hormone (Somatropin)?
Commonly reported ranges for Human Growth Hormone (Somatropin): 2-4 IU/day for anti-aging, 4-8 IU/day for body composition. Cycle length: 16-52 weeks (minimum 16 weeks for results). These are compiled from published studies and community-reported usage — individual response varies and lower end is always preferred.
Does Human Growth Hormone (Somatropin) suppress natural testosterone?
Human Growth Hormone (Somatropin) causes minimal suppression of the HPTA axis (score 0/10). PCT may still be advisable depending on stack and duration.
What is Human Growth Hormone (Somatropin) typically used for?
Human Growth Hormone (Somatropin) is commonly used for: Body recomposition, Recovery enhancement, Anti-aging, Fat loss. Intended-use context does not imply safety — every use case carries the same underlying pharmacological risks.
Is Human Growth Hormone (Somatropin) legal?
Human Growth Hormone (Somatropin) is a controlled substance in many jurisdictions (typically Schedule III in the US when it is an anabolic androgenic steroid). StackItSmart does not provide sourcing information. Possession, import, and use without a prescription carry legal consequences that vary by country and state.
Citations
- FDA Genotropin prescribing information. 2004. FDA NDA 020280 — IV half-life 0.4 hours (24 min); SC half-life 3.0 hours (absorption rate-limited)
- Renehan AG et al.. 2004. Lancet — IGF-1 linked to cancer risk in epidemiological review
- Liu H, et al. Systematic review: the effects of growth hormone on athletic performance. Ann Intern Med. 2008;148(10):747-58. PMID: 18347346
- Sattler FR, et al. Testosterone and growth hormone improve body composition and muscle performance. J Clin Endocrinol Metab. 2009;94(6):1991-2001. PMID: 19293261
Disclaimer
StackItSmart is an independent harm-reduction reference. The content above is compiled from peer-reviewed literature and is not medical advice, not an endorsement, and not a recommendation to use Human Growth Hormone (Somatropin). Performance-enhancing compounds carry legal, endocrine, cardiovascular, and hepatic risks. Consult a licensed clinician before any decision. StackItSmart does not provide sourcing, procurement, or dosing prescriptions.