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IGF-1 LR3 Research Review: Anabolic vs Metabolic Comparison
IGF-1 analogs differ not only in half-life but also in receptor selectivity and metabolic side-effect profiles. The following table compares IGF-1 LR3 against native IGF-1 and IGF-1 DES. The three most commonly used forms in anabolic research protocols. Native
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- IGF-1 analogs differ not only in half-life but also in receptor selectivity and metabolic side-effect profiles. The following table compares IGF-1 LR3 against native IGF-1 and IGF-1 DES. The three most commonly used forms in anabolic research protocols.
- Native IGF-1
- 10 minutes (free); 12–15 hours (bound)
- High affinity to all IGFBPs
- Moderate selectivity; significant insulin receptor cross-reactivity at high doses
- Acute signaling studies; requires continuous infusion for sustained effects
- Short half-life limits practical use in most protocols
- IGF-1 LR3
- 18–24 hours
- Minimal IGFBP binding
- High IGF-1R selectivity; reduced insulin receptor activation
- Muscle hypertrophy, regeneration, satellite cell activation, once-daily dosing studies
- Best choice for sustained anabolic signaling with simplified dosing
- IGF-1 DES (1-3)
- 20–30 minutes
- Very high IGF-1R selectivity; negligible insulin receptor cross-reactivity
- Local tissue studies; autocrine/paracrine signaling models
- Short half-life but extreme potency; useful for localized effects