IGF1 mediates the anabolic and mitogenic actions of growth hormone, making it central to studies of cell proliferation, metabolic signaling, and tumor biology. This ¹⁵N-labeled preparation spans residues 49–118, representing the full mature protein, and demonstrates an ED50 below 2 ng/ml in serum-free MCF-7 proliferation assays—corresponding to a specific activity exceeding 5.0 × 10⁵ IU/mg—which supports quantitative dose-response experiments in cancer cell lines and receptor-binding competition studies by surface plasmon resonance or ELISA. The stable isotope labeling enables NMR structural analysis and mass spectrometry–based receptor interaction mapping while preserving native bioactivity. Expressed in *E. coli* and purified to greater than 97% with endotoxin levels below 1.0 EU/μg, this material meets the quality thresholds commonly required for stem cell differentiation protocols, angiogenesis models, and antibody characterization workflows where both structural fidelity and functional potency are critical.
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