What is the half-life of IGF-1 LR3?
IGF-1 LR3 has a reported half life of ~20-30 hours, given subcutaneous. That is why it is typically dosed daily. A shorter half life means more frequent dosing to keep blood levels steady, a longer one lets you space doses further apart.
Quick facts
- Half-life: ~20-30 hours
- Route: Subcutaneous
- Typical schedule: Daily
- Cycle length: 4 weeks max, well-spaced breaks
References
- IGF-I and its analogs in clinical use — Clemmons DR, Endocrinol Metab Clin North Am, 2012
- Detection of His-tagged Long-R3-IGF-I in a black market product — Kohler M, Thomas A, Walpurgis K, et al., Growth Hormone & IGF Research, 2010
- Site-specific fluorescent derivatization and liquid chromatographic-mass spectrometric characterization of long R(3) IGF-I for bioanalytical applications — Harvey MD, Banks PR, Journal of Chromatography B, 2003
Pepdex is an editorial reference, not medical advice. Peptides vary in legal and approval status by country, many are research compounds without full human safety data. Talk to a qualified clinician before starting anything.
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Last updated 2026-06-06.