How does HGH (Somatropin) work?
Recombinant human growth hormone (somatropin), the actual 191-amino-acid protein your pituitary makes. Binds GH receptors on the liver to trigger IGF-1 production, and directly on muscle, fat, and bone for tissue effects. In plain terms, HGH (Somatropin) is recombinant human growth hormone, the protein itself, not a peptide that nudges your body to make more. Highest legal-risk compound in this catalog. Mechanistic detail like this comes largely from preclinical and early research, the human picture is limited.
What people use it for
- People who already have a legitimate medical prescription (GH deficiency, AIDS wasting, short stature)
- Educational reference, most users in this space run GH-axis peptides instead
References
- Growth Hormone Treatment in Adults with Growth Hormone Deficiency (clinical practice guideline) — Molitch ME et al., JCEM, 2011
- The effects of treatment with recombinant human growth hormone on body composition and metabolism in adults with growth hormone deficiency — Salomon F, Cuneo RC, Hesp R, et al., New England Journal of Medicine, 1989
- Effects of human growth hormone in men over 60 years old — Rudman D, Feller AG, Nagraj HS, et al., New England Journal of Medicine, 1990
Pepdex is an editorial reference, not medical advice. Peptides vary in legal and approval status by country, many are research compounds without full human safety data. Talk to a qualified clinician before starting anything.
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Last updated 2026-06-06.