IGF-1

IGF-1 (insulin-like growth factor 1) is described in research as the primary mediator of growth hormone's effects. Studies examine its role in anabolic signaling, tissue growth, and the pathways that sit downstream of the growth-hormone axis. Recombinant forms of IGF-1 have been produced in expression systems such as Pichia pastoris, and pharmaceutical versions known as mecasermin and mecasermin rinfabate have been the subject of published clinical drug reviews.

Research describes IGF-1 as acting at its own receptor to trigger signaling cascades associated with protein synthesis and cellular proliferation. It is studied as the molecule through which much of growth hormone's activity is actually expressed. Cell studies have linked IGF-1 receptor activity to PI3K/Akt signaling, a pathway associated with growth and survival, which is one reason IGF-1 is also examined in cancer biology research.

Animal work has examined recombinant IGF-1 effects on bone composition and remodeling in adult mice with Pappa2 deficiency, organ-specific growth in fetal sheep, and, combined with IGFBP-3, intraventricular hemorrhage prevention and survival in a preterm rabbit pup model. Other research has explored how altered IGF-1 bioavailability relates to sex-specific metabolic changes. These are research findings in models and do not establish outcomes in humans.

Human safety data for research-grade IGF-1 are limited, and adverse events are not summarized in the cited preclinical studies. Because IGF-1 promotes cellular proliferation, cell research has examined its role in breast cancer cell invasion and migration through PI3K/Akt signaling. Animal studies have also reported sex-specific differences in bone and metabolic responses, indicating that effects may vary with biological context.

Research protocols have used 20 to 100 mcg per administration, once daily in the morning, in 4-week blocks followed by 4 weeks off, with a subcutaneous route described. These figures reflect what protocols have reported and are not a recommendation. Each CoreX order ships with a protocol guide for laboratory reference. CoreX products are sold for laboratory research use only.