Direct growth hormone injection is subject to negative feedback, where high blood levels cause the pituitary and brain to shut down endogenous growth hormone production; this drove the development of secretagogue peptides that stimulate the body's own growth hormone release by mimicking hypothalamic signals rather than directly supplying growth hormone.
causalpending
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Andrew HubermanEvidence Quote
“people have developed peptide therapeutics that stimulate the release of growth hormone and thereby the release of IGF-1, but not by directly stimulating the growth hormone pathway.”
Created: 6/18/2026, 1:57:48 PM
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