Evidence Grade A — Regulatory approved. 402 published studies. 789 registered clinical trials.
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Somatropin is laboratory-made human growth hormone, identical to what the pituitary gland naturally produces. It is the standard treatment for growth hormone deficiency in children and adults, and is also approved for several other growth-related conditions. Available from multiple manufacturers under many brand names (Genotropin, Humatrope, Norditropin, Omnitrope, and others), it requires daily injections — a burden that newer weekly alternatives are now beginning to address.
Somatropin is also known by these brand and alternate names:
402 published studies: 282 human, 16 animal, 12 in-vitro, 72 reviews
Somatropin has been available since the mid-1980s and is one of the most established peptide therapies. It is sold under numerous brand names including Genotropin, Humatrope, Norditropin, and Omnitrope (the first biosimilar approved in the US, 2006). Approved indications include childhood and adult growth hormone deficiency, Turner syndrome, children born small for gestational age, Prader-Willi syndrome, idiopathic short stature, and short stature from chronic kidney disease.
Daily injection has been the main burden of somatropin therapy, particularly for paediatric patients who may require years of treatment. This has driven the development of once-weekly alternatives (somatrogon and somapacitan), which are gradually changing the treatment landscape. Annual treatment costs remain substantial, and concerns about misuse in anti-ageing and performance enhancement contexts are ongoing.
Growth hormone is one of the body's master hormones, orchestrating growth, metabolism, and body composition throughout life. When the pituitary gland does not produce enough, somatropin replaces it directly. Once injected, it triggers the liver to produce IGF-1 (insulin-like growth factor 1), which is the main driver of growth in children. In adults, growth hormone maintains bone density, muscle mass, and healthy body fat distribution, and supports cardiovascular and metabolic function.
Somatropin has decades of clinical data and is one of the oldest biotechnology products still in widespread use. The biosimilar landscape has expanded significantly since Omnitrope became the first US biosimilar in 2006, improving access and reducing costs. The main practical challenge is the daily injection requirement, particularly for children who may need years of treatment. This has driven the development of once-weekly alternatives (somapacitan and somatrogon), which are gradually changing the treatment landscape. Safety considerations include a theoretical cancer risk related to IGF-1 elevation (large studies are inconclusive), pressure in the brain (intracranial hypertension), and hip joint problems in growing children. Misuse of growth hormone for anti-ageing and athletic performance purposes remains a public health concern.
PeptideTrace tracks 789 registered clinical trials for Somatropin sourced from ClinicalTrials.gov.
Antineoplaston Therapy in Treating Patients With Neuroendocrine Tumor That Is Metastatic or Unlikely to Respond to Surgery or Radiation Therapy
Growth Hormone Use in Cystic Fibrosis - a Multicenter Study
Administration of Growth Hormone to Increase CD4+ Count in Patients Taking Anti-HIV Drugs
Evaluation of rhGH Replacement Therapy in Patients With Pseudohypoparathyroidism Type Ia (PHP Ia)
Growth Hormone Treatment of Children With HIV-Associated Growth Failure
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Somatropin is recombinant human growth hormone (rhGH), a 191-amino-acid single-chain protein with two intramolecular disulfide bonds (Cys53-Cys165 and Cys182-Cys189). It is identical to endogenous pituitary-derived GH. Multiple brands exist from different manufacturers.
Somatropin binds the growth hormone receptor (GHR, a class I cytokine receptor), inducing receptor dimerization and activation of the JAK2-STAT5 signaling pathway. This stimulates hepatic IGF-1 production (the primary mediator of growth-promoting effects) and exerts direct tissue effects including lipolysis, protein synthesis, and skeletal muscle anabolism. GH also promotes linear bone growth via IGF-1-mediated chondrocyte proliferation at the growth plates.
Somatropin is marketed under multiple brands including Genotropin, Humatrope, Norditropin, Nutropin AQ, Saizen, Omnitrope, Zomacton, and others. Omnitrope (Sandoz, 2006) was the first follow-on protein product approved in the US. FDA-approved indications include pediatric GHD, adult GHD, Turner syndrome, small for gestational age (SGA), Prader-Willi syndrome, idiopathic short stature (ISS), Noonan syndrome, SHOX deficiency, short bowel syndrome (Zorbtive), and HIV-associated wasting (Serostim). All formulations require daily subcutaneous injection.
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Somatrogon is marketed as Ngenla (approved June 2023) for paediatric growth hormone deficiency in children aged 3 years and older. In the pivotal trial, once-weekly somatrogon produced growth rates equivalent to daily somatropin injections (10.1 cm/year versus 9.8 cm/year), confirming that reducing injection frequency does not compromise growth outcomes. Ngenla represents a meaningful advance for paediatric patients and their families, reducing injections from 365 to 52 per year. Treatment adherence has been a persistent challenge with daily growth hormone, and weekly dosing is expected to improve long-term outcomes through better compliance. Somatrogon competes directly with somapacitan (Sogroya), the other approved weekly growth hormone, creating a new generation of less burdensome treatment options.
Somapacitan is marketed as Sogroya (approved August 2020 for adult growth hormone deficiency; expanded April 2023 to paediatric growth hormone deficiency in children aged 2.5 years and older). It is the first once-weekly growth hormone approved for both adult and paediatric patients. In adults, clinical trials showed improvements in body composition including reduced truncal fat. In children, growth rates were comparable to daily somatropin. The albumin-binding approach provides predictable drug levels with lower peak-to-trough variation than some other long-acting growth hormone technologies. Sogroya competes with somatrogon (Ngenla) in the growing once-weekly growth hormone market, with both products expected to gradually replace daily injections as the standard of care.
ACE-031 has no marketing authorisation. A Phase I trial in healthy women showed increased lean mass and decreased fat mass. A Phase II trial in DMD (24 patients) showed lean body mass increases but was discontinued due to bleeding-related safety concerns (epistaxis, telangiectasias, and gum bleeding), likely caused by inhibition of BMP-9/10 vascular signalling. ACE-031 is a large fusion protein (~90 kDa), not a peptide. Its clinical development was halted. The non-selective ligand-trapping profile — capturing beneficial vascular signalling molecules alongside the intended muscle-growth targets — illustrates the challenge of targeting the TGF-beta superfamily. Acceleron subsequently developed more selective agents.
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