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It increased surface GHRs in a biphasic manner, with a peak response at 10 nmol/L, and it modulated GH-induced Janus kinase-2 phosphorylation in parallel with the expression of surface GHRs [8]

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The reasons are both scientific and practical: Scientific rationale: Combination administration confounds mechanistic analysis you can't attribute observed effects to a specific compound Receptor saturation means diminishing returns from redundant agonism Novel adverse event profiles from untested combinations introduce uncontrolled variables Practical considerations: Retatrutide already encompasses semaglutide's entire receptor profile plus two additional pathways Research compound costs double with no established mechanistic justification No published protocol exists for combined dosing, titration, or timing For researchers deciding between these compounds individually, our retatrutide vs semaglutide comparison covers the trade-offs in depth