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

ClassGrowth Hormone
Half-life2-3 hours
Detection window1 days
HepatotoxicityNone
Suppression0/10
Administrationsubcutaneous

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.

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

  1. 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)
  2. Renehan AG et al.. 2004. Lancet — IGF-1 linked to cancer risk in epidemiological review
  3. de la Motte S et al.. 2001. Arzneimittelforschung — Subcutaneous somatropin terminal t½ 2-4h via flip-flop absorption-limited PK; intrinsic metabolic t½ only ~20-30 min
  4. Liu H, Bravata DM et al.. 2008. Ann Intern Med — Systematic review of 44 articles / 27 RCTs in physically fit subjects: mean GH dose 36 mcg/kg/day; lean mass gain +2.1 kg but no strength or aerobic capacity improvement
  5. Sattler FR et al.. 2009. J Clin Endocrinol Metab — RCT in older men: testosterone+GH increased lean mass and strength; GH alone increased lean mass with adverse BP changes

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.

Skip to main content