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How Tesamorelin Works: The GHRH Mechanism Explained

Most fat loss treatments work peripherally: they suppress appetite, increase metabolism, or block fat absorption. Tesamorelin works upstream, at the hypothalamic-pituitary axis level.

What Happens at the Pituitary Level?

Tesamorelin binds to GHRH receptors on somatotroph cells in the anterior pituitary. This triggers a pulsatile release of endogenous growth hormone (GH), which is physiologically important because it mimics the natural GH secretion pattern rather than flooding the body with supraphysiological levels. The GH pulse then stimulates the liver to produce IGF-1, which mediates most of the downstream effects on body composition.

Why Does It Specifically Target Visceral Fat?

Visceral adipocytes (the fat cells surrounding organs in the abdominal cavity) are highly sensitive to GH and IGF-1 signaling. They express more GH receptors than subcutaneous fat cells and are more responsive to lipolysis signals. When tesamorelin increases GH output, these visceral fat cells break down preferentially. Subcutaneous fat is less affected, which is why tesamorelin does not produce the lean, deflated look associated with caloric restriction. It specifically attacks the fat that drives metabolic disease.