How to use tesamorelin effectively, what IGF-1 levels to target, and why blood work is non-negotiable when using GH secretagogues.
What Is Tesamorelin? Tesamorelin is an FDA-approved synthetic analog of growth hormone-releasing hormone (GHRH). Unlike direct GH administration, tesamorelin stimulates your pituitary gland to produce GH in a pulsatile, physiologically normal pattern — preserving natural feedback regulation. It was originally approved for HIV-associated lipodystrophy but has since become one of the most used peptides in longevity and body composition protocols, driven by its robust effects on IGF-1, visceral adipose tissue, and metabolic parameters.
**Dose:** 1–2 mg subcutaneous injection
**Timing:** Bedtime, on an empty stomach (fasted 2–3 hours prior)
**Frequency:** Daily (5 days on, 2 days off is common to reduce desensitization)
**Cycle:** 3–6 months, then assess labs
Pre-reconstituted formulations at 3 mg/mL are available from compounding pharmacies — these simplify dosing significantly.
Tesamorelin's effects flow through one primary pathway: GHRH → GH pulse → IGF-1 production in the liver. IGF-1 (Insulin-like Growth Factor 1) is your primary biomarker for protocol efficacy.
**Optimal IGF-1 range for longevity protocols:** 200–310 ng/mL (age-adjusted)
**Below 150:** Likely inadequate GH signaling — consider dose optimization
**Above 350:** Reassess dosing — supraphysiologic IGF-1 carries long-term risk
**Testing timing:** Draw IGF-1 in the morning, 12+ hours after your last tesamorelin injection for a stable baseline reading.
**Weeks 1–4:** Improved sleep quality (deep sleep), water retention (temporary), some users note improved skin texture
**Weeks 6–8:** IGF-1 increase detectable on labs — expect 30–60% increase from baseline at therapeutic doses
**Weeks 8–12:** Visible visceral fat reduction, improved body composition, energy improvements
**Weeks 12+:** Sustained effects with consistent use; some users cycle off for 4–8 weeks then resume
**Glucose/HbA1c:** GH can cause transient insulin resistance. Monitor fasting glucose and HbA1c at each lab draw. If fasting glucose rises above 100 or HbA1c approaches 5.7, reassess dose.
**Cortisol:** Shift workers and high-stress individuals often have blunted GH response. If your cortisol is chronically elevated, IGF-1 response to tesamorelin may be suboptimal.
**Thyroid (TSH, T3/T4):** GH secretagogues can unmask subclinical hypothyroidism. If your TSH rises or you feel fatigue despite IGF-1 improvement, check a full thyroid panel.
Tesamorelin pairs well with Ipamorelin — a GHRP (growth hormone releasing peptide) that works through a complementary receptor (ghrelin receptor vs GHRH receptor). Together they produce a more robust GH pulse than either alone.
The combination works best when tesamorelin is taken at bedtime and ipamorelin is taken separately (morning or pre-workout).
Enter your baseline IGF-1, glucose, HbA1c, and cortisol before starting tesamorelin. Set a 6-week lab reminder and track the delta on each draw. StackAI will analyze your full panel in context — flagging glucose trends, correlating IGF-1 response with your cortisol and thyroid status, and adjusting recommendations based on your actual data.
Enter your blood work in MyProtocolStack, run StackAI analysis, and get personalized insights based on your actual numbers — not generic charts.
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