CJC-1295 without DAC (Mod GRF 1-29) is a short-acting GHRH analog that binds and activates pituitary GHRH receptors to stimulate brief, pulsatile growth hormone release. Lacking the Drug Affinity Complex, it is not albumin-bound and clears within roughly half an hour, producing discrete GH pulses rather than the sustained elevation of the DAC form.

N-terminal truncation eliminates IGFBP binding, leaving nearly all circulating IGF-DES unbound and active. Results in substantially higher tissue IGF-1R activation versus native IGF-1 at equivalent doses. Activates PI3K/Akt/mTOR for muscle hypertrophy and satellite cell proliferation.