Storage Stability
Mechanism of Action
No IGFBP Binding
Full-length IGF-1 is 99% bound to IGF-binding proteins in circulation, which regulate its bioavailability. DES lacks the N-terminal tripeptide that IGFBPs recognize, so it circulates and acts in free form, explaining its dramatically higher potency at the receptor level.IGF-1R Activation
DES binds the IGF-1 receptor with similar or slightly lower intrinsic affinity than IGF-1, but its free (unbound) state means far more receptor engagement per mole administered.Localized vs. Systemic
Due to its short half-life, DES acts locally when injected intramuscularly. Unlike IGF-1 LR3 (which circulates systemically for hours), DES primarily affects the injection site tissue, making it the choice for localized muscle research.Research Summary
Muscle Hypertrophy (Local)
In rodent studies, intramuscular IGF-1 DES injection promotes local satellite cell activation and muscle fiber hypertrophy at the injection site with minimal systemic effects.CNS Activity
IGF-1 DES is the predominant IGF-1 form in the brain (produced locally by neurons and glia). It plays roles in neuronal survival, synaptogenesis, and myelination, distinct from peripherally-acting IGF-1.Potency Comparison
In cell culture assays, DES is ~5–10x more potent than IGF-1 LR3 at stimulating myoblast proliferation, reflecting the IGFBP-free advantage.Calculate your IGF-1 DES dose Vial strength, BAC water, exact syringe draw in IU. Free, no signup. Open Calc →
Research Protocols
Reconstitution
Critical: IGF-1 DES must be reconstituted with dilute acetic acid (0.1–1% acetic acid or AA solution), not BAC water or sterile water. Alkaline or neutral pH denatures the peptide. Add acetic acid first, then dilute with sterile saline.Dosing
50–100 µg intramuscularly into target muscle, 1–2x daily. Dose immediately pre- or post-workout for muscle hypertrophy research.Cycle
4–8 weeks. Longer cycles risk receptor desensitization and IGF-1R downregulation.Storage & Handling
Store lyophilized" class="wiki-gloss-link">lyophilized at -20°C. Reconstitute with 0.1% acetic acid, NOT bacteriostatic water. After reconstitution, store at 2–8°C and use within 2–3 weeks. Do not freeze reconstituted solution. Acetic acid reconstitution maintains peptide integrity at refrigerator temperatures.
References
- [1]Francis GL, et al. "Des(1-3)IGF-1: a truncated form of insulin-like growth factor-I." Biochem J, 1992.
- [2]Ballard FJ, et al. "Production and role of IGF binding protein-4 in cells." J Cell Physiol, 1996.
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