What Is DAC (Drug Affinity Complex)?
Category: Pharmacology
A chemical modification added to CJC-1295 that extends its half-life from minutes to about 8 days by binding to serum albumin in the blood.
Detailed Explanation
The Drug Affinity Complex (DAC) is a chemical modification technology that dramatically extends the half-life of peptides by enabling them to bind to serum albumin, the most abundant protein in blood plasma. When applied to CJC-1295, DAC extends the half-life from approximately 30 minutes to 6-8 days. This modification transforms a short-acting peptide requiring multiple daily injections into a long-acting one requiring only weekly administration.
Practical Context
The DAC modification creates a trade-off: convenience vs. physiological accuracy. CJC-1295 with DAC requires only 1-2 injections per week, but it creates a continuous, non-pulsatile elevation of GH. CJC-1295 without DAC requires 2-3 daily injections but produces a more natural pulsatile GH release pattern. Most researchers prefer the non-DAC version for its more physiological GH profile.
Frequently Asked Questions
Is CJC-1295 with DAC better than without?
Neither is objectively better. With DAC offers convenience (weekly dosing) but less natural GH patterns. Without DAC (Mod GRF 1-29) requires multiple daily doses but produces more physiological pulsatile GH release.
Related Peptides
- CJC-1295 (with DAC) - A GHRH analog with Drug Affinity Complex for extended half-life. (Dosage | Calculator)
- CJC-1295 (no DAC) - A GHRH analog that stimulates growth hormone release without the Drug Affinity Complex. (Dosage | Calculator)
Related Terms
- CJC-1295 - A synthetic analog of growth hormone releasing hormone (GHRH). Available in two forms: with DAC (long-acting, dosed weekly) and without DAC/Mod GRF 1-29 (short-acting, dosed 2-3x daily).
- Half-Life - The time it takes for half of a substance to be eliminated from the body. Determines dosing frequency - shorter half-life peptides need more frequent dosing.
- GHRH (Growth Hormone Releasing Hormone) - A category of peptides that amplify growth hormone pulses. Examples include CJC-1295 and Sermorelin. Most effective when combined with a GHRP.