Variants with and without DAC are distinct compounds
Human long-acting CJC-1295 studies measured hormone exposure. A human pulsatility study does not support the simple claim that DAC abolishes GH pulses.
Those studies do not validate every product marketed as CJC without DAC or a nightly community combination. Higher GH/IGF-1 is not itself better sleep or injury recovery.
Sources and proposed-mechanism explanation
The rationale combines growth-hormone-releasing signaling with another secretagogue. Proposed complementary actions do not demonstrate additional functional benefit.