CJC-1295 No DAC

CJC-1295 without DAC, also known as Modified GRF (1-29) or Mod-GRF, is a synthetic analog of the first 29 amino acids of human growth hormone-releasing hormone (GHRH). The native GHRH(1-29) fragment, also called Sermorelin, has a plasma half-life of less than 10 minutes due to rapid enzymatic degradation. CJC-1295 No DAC incorporates four amino acid substitutions at positions 2, 8, 15, and 27 that protect it from DPP-4 and other proteases, extending its effective half-life to approximately 30 minutes. This modification preserves the natural pulsatile pattern of GH release while providing meaningful protection against degradation.

As a GHRH analog, CJC-1295 No DAC binds to the GHRH receptor on anterior pituitary somatotroph cells, activating the adenylyl cyclase-cAMP-PKA signaling cascade. This triggers calcium influx through voltage-gated calcium channels, which stimulates the exocytosis of stored growth hormone vesicles. Importantly, CJC-1295 No DAC amplifies the body's natural GH pulses rather than creating a sustained artificial elevation. This preserves the physiological pulsatile secretion pattern that is critical for GH receptor sensitivity — continuous GH exposure (as seen with exogenous HGH) leads to receptor downregulation, while pulsatile release maintains receptor responsiveness.

Research has documented that CJC-1295 No DAC produces significant increases in GH amplitude (peak GH levels during pulse) without substantially altering pulse frequency. Studies show 2-10 fold increases in GH secretion following administration, with concurrent elevations in IGF-1 of 40-100% above baseline. The preservation of natural pulsatility makes it particularly attractive to researchers investigating GH optimization without the side-effect profile of exogenous HGH administration. Benefits documented in the literature include improved body composition, enhanced recovery, improved sleep quality, and increased collagen synthesis.

CJC-1295 No DAC is best suited for researchers investigating natural-pattern GH optimization, anti-aging protocols, recovery enhancement, and body composition improvement. It is almost always used in combination with a GHRP (growth hormone releasing peptide) such as Ipamorelin — the CJC/Ipa combination is the most widely referenced GH peptide stack in the research community. The GHRH analog (CJC) provides the release signal while the GHRP (Ipamorelin) amplifies it, producing a synergistic GH pulse 3-5 times greater than either compound alone.

Reconstitute with 2.5ml bacteriostatic water (yielding 2mg/ml). Administer via subcutaneous injection, typically 100mcg per dose, 1-3 times daily. Optimal timing is pre-sleep (when natural GH pulse is strongest), upon waking, and/or post-workout. The 30-minute half-life means timing matters — inject 15-30 minutes before sleep or food. Store at 2-8C after reconstitution. CJC-1295 No DAC is sensitive to heat and agitation; avoid shaking the vial.