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What is somatropin Somatropin, also known as human growth hormone (HGH), is a peptide hormone naturally secreted by the pituitary gland. It regulates growth, cell regeneration, and metabolism, supporting the development of muscle, bone, and connective tissues. The liquid form of somatropin is a ready-to-use recombinant version of natural growth hormone, created using biosynthetic technology. Unlike lyophilized (dry) HGH that must be reconstituted, liquid somatropin is stabilized in solution, m..