Somatropin FAQ: common questions answered
Prescription human growth hormone, with no proven anti-aging benefit.
Also called: HGH, hGH, rhGH, recombinant human growth hormone, Genotropin, Humatrope, Norditropin, Omnitrope, Saizen, Zomacton, Serostim, Zorbtive, Nutropin AQ.
Growth hormone · Recombinant human growth hormone receptor agonist · Evidence: Approved drug.
- Is Somatropin FDA-approved? Yes: Genotropin (adult/pediatric GHD; pediatric Prader-Willi, Turner, SGA without catch-up growth and idiopathic short stature.); Humatrope (adult/pediatric GHD; pediatric Turner, SHOX deficiency, SGA and idiopathic short stature.); Norditropin (adult/pediatric GHD; pediatric Noonan, Turner, SGA, Prader-Willi and idiopathic short stature.). FDA restricts distribution for unapproved uses, including anti-aging, bodybuilding and athletic enhancement, under 21 USC 333(e). “Research use only” does not authorize human use.
- How do people take it? Under the skin, once daily. Source: drug label.
- What's the difference between Somatropin and Retatrutide? Somatropin: prescription human growth hormone, with no proven anti-aging benefit. Retatrutide: an experimental weekly injection with phase 3 weight-loss results. Why people pair them: users combine them for fat loss or to offset GH-related glucose effects. No controlled trial was found for this stack.
- Can I take it with Retatrutide? Users combine them for fat loss or to offset GH-related glucose effects. No controlled trial was found for this stack. Claims of glucose protection are unproven; each drug’s risks remain. Source: reported by users. Ask a doctor before combining anything.
- Is it banned in sport? Yes. It is banned in and out of competition (WADA 2026). Prohibited in and out of competition under the 2026 list.
- How long does a mixed vial last? Genotropin cartridges: 28 days at 2–8°C. Omnitrope vial: 21 days. Serostim 4 mg with its bacteriostatic diluent: 14 days; 5/6 mg with sterile water: use immediately.
Related to Somatropin
- Retatrutide: An experimental weekly injection with phase 3 weight-loss results.
- BPC-157: An experimental repair peptide with mostly animal evidence and a few small human reports.
- TB-500: A short piece of thymosin beta-4 with no proven repair benefit in humans.
- Ipamorelin: An experimental peptide that triggers growth hormone release.
Sources
- Import Alert 66-71, 2026
- Saizen, 2026
- The 2026 Prohibited List, World Anti-Doping Agency · WADA · 2026
- ACMD advice on somapacitan, lonapegsomatropin and somatrogon (accessible), 2025
- DailyMed - NUTROPIN AQ NUSPIN 5- somatropin injection, solution NUTROPIN AQ NUSPIN 10- somatropin injection, solution NUTROPIN AQ NUSPIN 20- somatropin injection, solution, 2025
- Genentech Provides Update on Nutropin AQ (somatropin) NuSpin formulations in the United States, 2024
- SAIZEN (somatropin) for injection, for subcutaneous use, 2020
- AMERICAN ASSOCIATION OF CLINICAL ENDOCRINOLOGISTS AND AMERICAN COLLEGE OF ENDOCRINOLOGY GUIDELINES FOR MANAGEMENT OF GROWTH HORMONE DEFICIENCY IN ADULTS AND PATIENTS TRANSITIONING FROM PEDIATRIC TO ADULT CARE., Yuen KCJ et al. · Endocrine practice : official journal of the American College of Endocrinology and the American Association of Clinical Endocrinologists · 2019
- Evaluation and treatment of adult growth hormone deficiency: an Endocrine Society clinical practice guideline., Molitch ME et al. · The Journal of clinical endocrinology and metabolism · 2011
- DailyMed - GENOTROPIN- somatropin kit
- DailyMed - HUMATROPE- somatropin kit
- DailyMed - NORDITROPIN- somatropin injection, solution
- DailyMed - OMNITROPE- somatropin injection, solution OMNITROPE- somatropin kit
- DailyMed - SEROSTIM- somatropin kit
- DailyMed - ZOMACTON- somatropin kit
Sources checked: 2026-10-18.
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