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Glossary

GHRH analogue

Also written growth hormone releasing hormone, GHRH

A synthetic version of the hormone that tells the pituitary to release growth hormone. One of the two receptor routes into a growth hormone pulse.

The body raises growth hormone through two levers: growth-hormone-releasing hormone from the hypothalamus, and ghrelin acting on a separate receptor. GHRH analogues copy the first.

This is why pairing a GHRH analogue with a ghrelin-receptor agonist is the one combination in this category with a real mechanistic argument. The two act on different receptors, so the case is that they add instead of overlapping.

Sermorelin, CJC-1295 and tesamorelin are GHRH analogues, and they differ enormously in evidence: tesamorelin completed a phase 3 programme and holds an approval, the other two have neither.