Tesamorelin & IGF-1: Tracking Real Results With Blood Work
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.
Standard Protocol
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.
Why IGF-1 Is Your Key Tracking Marker
Tesamorelin effects flow through one primary pathway: GHRH to GH pulse to 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 or more hours after your last tesamorelin injection for a stable baseline reading.
What to Expect -- Timeline
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
Interactions With Other Labs
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 cortisol is chronically elevated, IGF-1 response to tesamorelin may be suboptimal.
Thyroid (TSH, T3/T4): GH secretagogues can unmask subclinical hypothyroidism. If TSH rises or you feel fatigue despite IGF-1 improvement, check a full thyroid panel.
Synergies
Tesamorelin pairs well with Ipamorelin -- a GHRP that works through a complementary receptor (ghrelin receptor vs GHRH receptor). Together they produce a more robust GH pulse than either alone.
Tracking on MyProtocolStack
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 cortisol and thyroid status, and adjusting recommendations based on your actual data.
The information in this article is for educational purposes only. It does not constitute medical advice. Always consult a licensed healthcare provider before starting any peptide protocol.
Written by Ryan -- Founder, MyProtocolStack. Last Updated: April 2026.
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