What Is Somatropin?
Somatropin explained: what it is, how it relates to HGH, and why its product labeling matters for measurement and units.
Last updated November 11, 2026
Somatropin and HGH
Human growth hormone (HGH) is a protein hormone made by the pituitary gland. Somatropin is the nonproprietary name for the recombinant form: growth hormone produced using recombinant DNA technology. Official product information for at least one somatropin product states that it is produced in E. coli cells by recombinant DNA technology.
Why the name matters for readers
When you read an official label you will see “somatropin” rather than “HGH”. Searching by the drug name finds the labeling on DailyMed and Drugs@FDA. Brand names exist, but the underlying name is the same.
Regulatory status
Somatropin products are prescription medicines in the United States, and their official labeling describes the approved uses, strengths and presentations. This site does not discuss uses, dosing or sourcing. It focuses on measurement concepts.
Forms and presentations
Somatropin products come in different presentations, such as powder in a vial or cartridge for reconstitution, or ready-to-use forms. Strengths and, where stated, the concentration after mixing are given on each product’s label. One official label, for example, lists concentrations after reconstitution for each cartridge size.
Why labeling matters for the math
A calculator can divide numbers, but it cannot know your product. The label establishes the strength, the units used, the liquid to be used and any stated resulting concentration. When the label and a calculator disagree, the label is correct.
Where to read the official information
Use DailyMed and Drugs@FDA and search for the product name. See also Understanding HGH vial labels.