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Mod GRF (1-29) or Modified Growth Releasing Factor 1-29 is a Modified version of the shortest effective Growth Hormone Releasing Hormone available. It provides a longer GH pulse than the unmodified GRF (1-29) or Sermorelin, But shorter than other Growth Hormones Releasing Hormones such as cjc-1295.Mod GRF (1-29) is often preferred in research as it provides a GH pulse release that very similarly mimics GH pulses often observes to be naturally occurring in research subjects.Mod GRF (1-29) offers multiple benefits such as increased fat loss, increased lean body mass (muscle), improved sleep, improved overall sense of well being and many others.
Refs: Frohman LA (1986). "Rapid enzymatic degradation of growth hormone-releasing hormone by plasma in vitro and in vivo to a biologically inactive product cleaved at the NH2 terminus". J Clin Invest 78 (4): 906–913. doi:10.1172/JCI112679. PMC 423714. PMID 3093533Jetté L, Léger R, Thibaudeau K, Benquet C, Robitaille M, Pellerin I, Paradis V, van Wyk P, Pham K, Bridon DP (2005). "Human Growth Hormone-Releasing Factor (hGRF)1–29-Albumin Bioconjugates Activate the GRF Receptor on the Anterior Pituitary in Rats: Identification of CJC-1295 as a Long-Lasting GRF Analog". Endocrinology 146 (7): 3052–8. doi:10.1210/en.2004-1286. PMID 15817669R, Gulyas J, Schally AV, Reeves JJ. (1988). "Analogs of growth hormone-releasing hormone induce release of growth hormone in the bovine". J Anim Sci 66 (6): 1386–1392. PMID 3135287