CJC-1295 ve Ipamorelin: Stack Nasıl Çalışır

Summary

The CJC-1295 and Ipamorelin stack is the most widely used growth hormone peptide combination. It works because the two peptides trigger GH release through completely different receptor systems, producing a combined effect greater than either one alone.

How It Works

• CJC-1295 is a GHRH analog that binds GHRH receptors on pituitary somatotroph cells, signalling the pituitary to produce and release growth hormone. It has 4x greater receptor affinity than native GHRH (receptor binding study, 2010)
• Ipamorelin is a selective ghrelin receptor agonist (GHSR1a) that triggers GH release through an entirely separate pathway. A 1998 study (Raun et al.) showed it produces no cortisol or prolactin elevation even at 200x the effective dose
• Combined: CJC-1295 tells the pituitary to make GH. Ipamorelin tells it to release GH. Two signals, two pathways, one amplified pulse

Key Numbers

• Standard dose: 100-300mcg of each peptide, 1-3x daily via subcutaneous injection
• Cycle length: 8-16 weeks on, 4-8 weeks off
• Timeline: improved sleep by week 1-2, body composition changes by week 4-8
• DAC variant: extends CJC-1295’s half-life from 30 minutes to 6-8 days, but sacrifices pulsatile release pattern

View the CJC/IPA protocol data | Accumulation calculator

Two Pathways, One GH Pulse

Most peptide stacks combine compounds that work through similar mechanisms. The CJC-1295 and Ipamorelin combination doesn’t. These two peptides hit entirely different receptor systems on the same target cells.

CJC-1295 (also called Mod GRF 1-29 or Modified GRF) is a synthetic analog of growth hormone-releasing hormone. Your hypothalamus naturally produces GHRH to tell the pituitary gland to secrete growth hormone. CJC-1295 mimics that signal with roughly four times the binding affinity of the natural hormone (in vitro receptor binding study, 2010). It’s the accelerator.

Ipamorelin works through the ghrelin receptor, a completely separate signalling cascade. When ghrelin binds GHSR1a on pituitary somatotrophs, it triggers a calcium-dependent GH release that amplifies whatever GHRH is already doing. A 2002 cellular study (Cunha & Mayo) demonstrated that the presence of active GHS receptors potentiates GHRH signalling, meaning the two pathways don’t just add up. They multiply.

That’s the core argument for this stack. Not two peptides doing the same thing twice, but two peptides each removing a different bottleneck in GH secretion.

CJC-1295: The Signal Sender

CJC-1295 without DAC is a 30-amino-acid GHRH analog weighing 3,367.97 Daltons. Its half-life sits between 30 minutes and 2 hours, which matters more than it sounds.

That short half-life is actually the point. Natural GH secretion is pulsatile. Your pituitary fires GH in bursts throughout the day, with the largest pulse occurring during deep sleep. CJC-1295 without DAC preserves that pattern. A 2008 human study (24 subjects, 100mcg three times daily for 30 days) confirmed preserved natural GH pulsatility with no pituitary desensitization.

A 2006 pharmacokinetic study in 12 subjects showed peak GH at 15-30 minutes post-injection with doses of 100-200mcg. The GH pulse rises, does its work, and clears. Just like the body intends.

Molecular weight: 3,367.97 Da | Half-life: 30 min - 2 hours | 30 amino acids

Ipamorelin: The Clean Releaser

Ipamorelin is a pentapeptide weighing 711.85 Da. Five amino acids. Small molecule, big selectivity advantage.

The selectivity is what separates Ipamorelin from older growth hormone secretagogues like GHRP-2 and GHRP-6. All three bind the ghrelin receptor. But GHRP-2 and GHRP-6 also jack up cortisol, prolactin, and appetite. Ipamorelin doesn’t. Raun et al. (1998) showed zero significant cortisol or ACTH elevation even at 200 times the effective GH-releasing dose. That study is why Ipamorelin became the default GHRP for clinical protocols.

A 2019 GH stimulation study found consistent elevation 30-60 minutes post-injection at 200mcg daily over 8 weeks. A 2020 body composition trial (250mcg daily, 12 weeks) documented lean mass gains and bone density improvements in adults over 45. A 2021 sleep study showed improved sleep latency and increased slow-wave sleep at 200mcg before bed.

Molecular weight: 711.85 Da | Half-life: ~2 hours | 5 amino acids