CJC-1295 without DAC (modified GRF 1-29) is preferred for sleep applications due to its shorter half-life (30 minutes) allowing for timed GH pulses that align with natural nocturnal secretion patterns. Administration 30 minutes before bed mimics physiological GH release during early sleep stages. CJC-1295 with DAC provides sustained GH elevation that may be less optimal for circadian-synchronized sleep benefits.
PubMed: CJC-1295 pharmacology