Source comparison
DAC vs No-DAC: The Half-Life Trade-Off
This is the most common source of confusion. CJC-1295 comes in two variants, and they behave completely differently. DAC stands for Drug Affinity Complex. It’s a molecular modification that binds CJC-1295 to albumin in the blood, dragging its half-life from 30
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- This is the most common source of confusion. CJC-1295 comes in two variants, and they behave completely differently.
- DAC stands for Drug Affinity Complex. It’s a molecular modification that binds CJC-1295 to albumin in the blood, dragging its half-life from 30 minutes up to 6-8 days. A 2006 study (Teichman et al.) in 12 subjects showed sustained GH and IGF-1 elevation lasting 6-10 days from a single injection, with peak levels at 2-4x baseline.
- Sounds better, right? Longer duration, fewer injections. One shot a week instead of two or three daily.
- The problem is physiology. Your body doesn’t maintain GH at a constant elevated level. It pulses. The CJC-1295 DAC variant provides continuous GHRH receptor stimulation, which is closer to exogenous HGH than to natural GH patterns. A 2012 animal study over 6 months found evidence of reduced GH pulse amplitude with prolonged DAC use, suggesting receptor desensitization. A 2015 pharmacokinetic comparison confirmed that the non-DAC variant preserves more physiological secretion patterns.
- Half-life
- 30 min - 2 hours
- 6-8 days
- Dosing
- 100-300mcg, 2-3x daily
- 1-2mg, once weekly
- GH pattern
- Pulsatile (natural)
- Sustained elevation
- Desensitization risk
- Low
- Higher with prolonged use
- Ipamorelin pairing
- Strong (matched pulsatile timing)
- Reduced (continuous vs pulsatile conflict)
- Side effects
- Fewer, milder
- More water retention, joint issues
- Convenience
- Low (daily injections)
- High (weekly)
- Best for
- Long-term protocols, pairing with Ipamorelin
- Short cycles prioritizing convenience