CJC-1295 DAC and CJC-1295 (also known as Modified GRF 1-29) are Releasing Hormones (GHRH). Their action in the human body is identical but the difference between the two peptides are the span of the half-life. Modified GRF 1-29 and Sermorelin have a very short acting half-life of about 30 minutes, while CJC-1295 DAC has a half-life that can last up to approximately 8 days. Many a scientist have reported that the short half-life of Sermorelin and Modified GRF 1-29 is considered to be much more natural CJC-1295 NO-DAC(MOD GRF 1-29) description: CJC-1295 is a Long acting GHRH analog.hormone-releasing hormone (GHRH), also known as hormone-releasing factor (GRF or GHRF) or somatocrinin, is a 44-amino acid peptide hormone produced in the hypothalamus by the arcuate nucleus. GHRH stimulates hormone (GH) secretion from the pituitary. GHRH is released in a pulsatile manner, stimulating pulsatile release of GH respectively.