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Mechanism of action
Tesamorelin is a synthetic GHRH analog that activates pituitary GHRH receptors to increase pulsatile GH output and downstream IGF-1 signaling. It is mechanistically upstream of direct GH exposure.
Half-life & pharmacokinetics
Half-life: Approx. 8-11 min depending formulation.
FDA labeling for tesamorelin formulations reports very short elimination half-life values, roughly 8-11 minutes depending formulation; downstream GH/IGF-1 signaling persists beyond plasma presence.
Research dosing reference
1-2 mg daily in body-composition/GH-axis research contexts.
Dose interpretation (U-100 units)
| Target dose | U-100 units |
|---|---|
| 0.5 mg | 10 units |
| 1 mg | 20 units |
| 2 mg | 40 units |
Units are concentration-specific - confirm against your actual reconstitution volume.
Reconstitution & concentration
| Vial | Preferred reconstitution | Final concentration |
|---|---|---|
| 10 mg | 2 mL BAC Water | 0.050 mg/unit |
| 20 mg | 2 mL BAC Water | 0.100 mg/unit |
Injection timing
Often used before bed or during fasted windows to align with GH-axis signaling and reduce food-related interference.
Beginner escalation
Begin conservatively while monitoring hunger, edema, sleep quality, glucose response, and tingling/carpal-tunnel-like symptoms.
Side-effect mitigation
Monitor water retention, increased hunger, flushing, glucose variability, joint stiffness, or tingling. Periodic IGF-1 and glucose monitoring may be appropriate in longer protocols.
Stack compatibility
GH-axis agents stack most logically with complementary GH secretagogues; avoid overbuilding GH-axis stacks without monitoring IGF-1, glucose, and edema response.
Storage & stability
Lyophilized: refrigerated or controlled cool storage. Reconstituted: refrigerated, protected from heat/light, and handled aseptically.
Protocol duration & reassessment
GH-axis protocols should reassess every 8-12 weeks: IGF-1, fasting glucose/A1c where appropriate, edema, sleep quality, hunger, body-composition objectives, and continued need.
Frequently asked questions
What is Tesamorelin and how does it work?
Tesamorelin is a synthetic GHRH analog that activates pituitary GHRH receptors to increase pulsatile GH output and downstream IGF-1 signaling. It is mechanistically upstream of direct GH exposure.
What is the half-life of Tesamorelin?
Tesamorelin: Approx. 8-11 min depending formulation. FDA labeling for tesamorelin formulations reports very short elimination half-life values, roughly 8-11 minutes depending formulation; downstream GH/IGF-1 signaling persists beyond plasma presence.
How is Tesamorelin reconstituted for research?
Preferred reconstitution for the 10 mg vial is 2 mL BAC Water, giving 0.050 mg/unit. Always confirm concentration math before any use. Research use only.
Is Tesamorelin FDA approved?
No. Tesamorelin is an investigational research-use-only compound - not for human or animal consumption and not FDA approved.
Tesamorelin product overview · Tesamorelin cost · All research reference · Research guides
External references: Peptide (Wikipedia) · U.S. Food and Drug Administration