The selective mechanism

What "selective" really means here

Ipamorelin’s entire reputation rests on one word: selective. But selective for what, exactly? It is not selective for one receptor subtype over another. It is selective for the growth-hormone output over the stress-hormone and prolactin outputs that its predecessors triggered.

This unit unpacks that claim carefully: the head-to-head comparison that defined it, the idea of biased agonism that may explain it, what the hormone panel actually showed, and the honest limits, because selectivity demonstrated in short studies cannot simply be assumed to hold forever.