What Is the Molecular Structure of HGH?
Published 2026-07-11 · REVIVE Peptides Research Desk · 2 min read
Short answer: HGH is a single-chain polypeptide hormone made up of 191 amino acids, folded into a structure stabilized by two internal disulfide bonds, with a molecular weight of approximately 22 kilodaltons. Pharmaceutical recombinant somatropin is manufactured to reproduce this exact sequence and structure.
As a polypeptide hormone, HGH's biological activity depends heavily on its three-dimensional folded structure, not just its amino acid sequence — the two disulfide bonds within the molecule help stabilize this folded shape, which is necessary for it to bind correctly to growth hormone receptors on target cells. This structural dependency is a general feature of protein hormones, distinguishing them from small-molecule drugs.
This same structural profile is well documented across the endocrinology and biochemistry literature and has remained the reference standard since the hormone was first fully characterized; recombinant manufacturing is validated against this reference structure to confirm pharmaceutical somatropin matches the naturally occurring hormone.
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