TESAMORELIN MECHANISM
How Does Tesamorelin Work? Mechanism Explained
A GHRH analog that prompts your own growth hormone
How does tesamorelin work? Tesamorelin is a synthetic analog of growth hormone-releasing hormone (GHRH). Instead of being growth hormone itself, it signals the body to make more of its own. For its regulatory status, see the tesamorelin regulatory-status page.
The GHRH Pathway
GHRH is normally produced in the hypothalamus and travels to the pituitary gland, where it prompts the release of growth hormone (GH). Tesamorelin binds the same GHRH receptors on the pituitary, stimulating the pulsatile release of the body's own growth hormone.
Source: FDA prescribing information for EGRIFTA WR.
The Downstream Effect: IGF-1
Higher GH in turn raises insulin-like growth factor 1 (IGF-1), a hormone that mediates many of GH's effects. Because tesamorelin raises IGF-1, the approved label recommends monitoring IGF-1 during medically supervised treatment.
Why "Secretagogue" Matters
Tesamorelin is a secretagogue: it prompts your own gland to secrete a hormone, rather than replacing that hormone directly. This is different from injecting growth hormone itself, though it still affects the same endocrine axis and carries related risks.
Frequently Asked Questions
Is tesamorelin the same as growth hormone?
No. It stimulates your own pituitary to release growth hormone, rather than being growth hormone itself.
What is IGF-1's role?
It is a downstream hormone that rises when growth hormone rises, and is monitored during treatment.
The Bottom Line
Tesamorelin works by mimicking GHRH to prompt the body's own growth hormone and raise IGF-1 — that pathway is the clearest answer to how tesamorelin works.
This article is for general educational purposes only. It is not medical advice and should not be used to diagnose, treat, or make decisions about any health condition or medication.
Primary Sources
- FDA prescribing information for EGRIFTA WR
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