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Drug tolerance is defined as a loss of responsiveness to an agonist after continued exposure, without necessarily specifying the cellular or molecular mechanisms responsible

Nasal Dosing Nasal GHK-Cu is the least-studied route, and the evidence is thin

Although local communities always knew of its existence, it was a Peruvian explorer, Juan Arias Dvila, who officially reported it in 1710

Common Research Use Context

There is supporting evidence reporting adverse effects from long-term rhIGF-1 treatment including neoplastic formation, cataract and renal hypertrophy, all of which seem to be the most severe effects observed and are usually rare [123, 282284]