FDA-approvedRecombinant growth hormoneGrowth hormone deficiency
Somatropin (HGH 191AA)
Somatropin is recombinant human growth hormone (191 amino acids), FDA-approved under brands such as Norditropin and Genotropin for growth hormone deficiency.
What is Somatropin?
Somatropin is recombinant human growth hormone (191 amino acids), FDA-approved under brands such as Norditropin and Genotropin for growth hormone deficiency. Somatropin (HGH 191AA) is an FDA-approved prescription medicine (NORDITROPIN, NORDITROPIN FLEXPRO, NORDITROPIN NORDIFLEX, OMNITROPE); "research use only" vials sold online are not the approved product.
Key takeaways
- Somatropin (HGH 191AA) is an FDA-approved prescription medicine (NORDITROPIN, NORDITROPIN FLEXPRO, NORDITROPIN NORDIFLEX, OMNITROPE); "research use only" vials sold online are not the approved product.
- PubMed indexes 420 papers on Somatropin (72 tagged as clinical trials) as of October 19, 2026.
- ClinicalTrials.gov lists 818 registered studies using Somatropin.
- 5 vendors in our directory listed Somatropin in their public catalog on October 19, 2026.
Regulatory & access status
Somatropin (HGH 191AA) is an FDA-approved prescription medicine (NORDITROPIN, NORDITROPIN FLEXPRO, NORDITROPIN NORDIFLEX, OMNITROPE); "research use only" vials sold online are not the approved product.
- NORDITROPIN, NORDITROPIN FLEXPRO, NORDITROPIN NORDIFLEX — NOVO NORDISK INC, application BLA021148 (discontinued, prescription). Drugs@FDA
- OMNITROPE — SANDOZ, application BLA021426 (prescription). Drugs@FDA
- GENOTROPIN, GENOTROPIN PRESERVATIVE FREE — PHARMACIA, application BLA020280 (discontinued, prescription). Drugs@FDA
Sellers that market unapproved peptides for human use can receive FDA warning letters; our vendor directory links any letter we found on fda.gov.
How much research exists on Somatropin (HGH 191AA)?
PubMed indexes 420 papers mentioning Somatropin (HGH 191AA) in the title or abstract, 155 of them from the last five years and 72 tagged as clinical trials (search run October 19, 2026; repeat the search).
Most relevant recent papers
- Efficacy and Safety of Weekly Somatrogon vs Daily Somatropin in Children With Growth Hormone Deficiency: A Phase 3 Study. — J Clin Endocrinol Metab, 2022 · clinical trial
- Somatropin. — , 2006 · review
- Lonapegsomatropin. — , 2006 · review
- Somatrem. — , 2006 · review
- Weekly Lonapegsomatropin in Treatment-Naïve Children With Growth Hormone Deficiency: The Phase 3 heiGHt Trial. — J Clin Endocrinol Metab, 2021 · clinical trial
- Somatrogon. — , 2006 · review
Registered clinical studies
ClinicalTrials.gov lists 818 studies with Somatropin (HGH 191AA) as an intervention (see all). Most recent:
- Treatment of GHD Associated With CHF — NCT03775993 · Phase 3 · unknown · started 2019-03-01
- Long Protocol and Growth Hormone in Poor Responders — NCT02338206 · Phase 2 · completed · started 2015-03
- Effects of Ketone Bodies on Insulin Sensitivity — NCT07359625 · N/A · recruiting · started 2025-12-02
- A Real World Study of the Effect of Early PEG-rhGH Therapy on Cognitive Development of SGA Infants — NCT05144035 · Phase 4 · unknown · started 2022-04-06
- Web-based Adherence Information Integrated Nurse-led Monitoring Clinic — NCT04244123 · completed · started 2020-01-24
What the evidence does not show
- Paper counts measure research attention, not whether Somatropin works or is safe.
Research suppliers that list Somatropin
5 vendors in our directory listed a product matching Somatropin in their public catalog on October 19, 2026. Listed alphabetically; a listing is not an endorsement. Research use only.
Prices per mg, where we could verify them, are on our price comparison.
Somatropin reconstitution math
Lab arithmetic only, not dosing guidance: vial-by-vial concentration tables are on Somatropin 10 IU vial math.
Somatropin FAQ
Is Somatropin FDA-approved?
Somatropin (HGH 191AA) is an FDA-approved prescription medicine (NORDITROPIN, NORDITROPIN FLEXPRO, NORDITROPIN NORDIFLEX, OMNITROPE); "research use only" vials sold online are not the approved product.
Is Somatropin safe?
Safety data come from the published studies listed on this page; read them in full. Products sold as "research use only" have no FDA review of their purity, sterility or dose.
How much research is there on Somatropin?
PubMed indexes 420 papers on Somatropin (72 tagged as clinical trials) as of October 19, 2026.
Who sells Somatropin?
Peptide Worldwide, Peptide.Express, Pure Lab Peptides, Royal Peptides, San Diego Peptides listed it on their public catalogs when we checked; a listing is not an endorsement.
Related compounds
Follistatin-315FollistatinGHRHGHRP-6HexarelinMGFTesamorelinTesamorelin + CJC-1295 (no DAC) + ipamorelin blendAll growth hormone & ghrh