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HUBERMAN: Now, there are two general categories of peptides for stimulating the release of growth hormone
However, significant challenges remain, including the synthesis of stable tripeptides with good tissue penetration, insufficient understanding of their mechanisms of action, the scarcity of studies in larger animal models and human trials, and the lack of direct head-to-head comparisons with larger peptides [75, 95]
More concerning, humanin was eventually linked to breast and brain cancers
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