GHRP-6 is a synthetic peptide, injected to make the body release short bursts of its own growth hormone. That hormone effect is well proven, but no benefit for health or lifespan has been shown; its best-supported use is as a test for growth hormone deficiency. It also raises stress and milk-producing hormones and appetite, is flagged by regulators for weakening blood sugar control, and reaches users through unregulated suppliers. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Insulin-like growth factor 1 (IGF-1) | Age- and sex-specific laboratory reference interval | Main readable consequence of raised growth hormone |
| Fasting plasma glucose | 70–99 mg/dL (3.9–5.5 mmol/L) | Safety check; a rise is grounds to stop |
| Glycated haemoglobin | 4.0–5.6% | Detects sustained glucose drift |
| Fasting insulin | About 2.6–24.9 mU/L, laboratory-specific | Rises before glucose when insulin sensitivity falls |
| Morning serum cortisol | 5–25 µg/dL (138–690 nmol/L) | GHRP-6 directly stimulates the stress-hormone axis |
| Prolactin | Men 4–15 ng/mL; women 4–23 ng/mL | Sustained elevation suppresses sex-hormone output |
Cadence: Baseline fasting and in the morning before use; repeated at about four weeks, every three to six months during continued use, and whenever appetite, swelling or sleep changes markedly.