CJC-1295: The Growth Hormone Peptide That Works While You Sleep
CJC-1295 is a synthetic GHRH analog that amplifies the body's natural growth hormone pulses. Here's what the research shows about its effects on body composition, recovery, and sleep quality.
Growth hormone declines by roughly 14% per decade after age 30. By the time most people hit their 40s, nighttime GH pulses are a fraction of what they were at peak. CJC-1295 is one of the more studied tools for addressing that decline — not by flooding the body with exogenous hormones, but by amplifying the pulses the body already produces.
What Is CJC-1295?
CJC-1295 is a synthetic analog of growth hormone-releasing hormone (GHRH), the peptide your hypothalamus naturally secretes to trigger GH release from the pituitary gland. The original CJC-1295 was modified with a technology called Drug Affinity Complex (DAC), which binds the peptide to albumin in the blood, dramatically extending its half-life from minutes to several days.
You'll also see "CJC-1295 without DAC" on the market, which is technically a different compound — usually referred to as Modified GRF (1-29) or Mod GRF. Without DAC, the half-life drops back to 30 minutes, which produces a more natural, pulsatile GH release rather than a sustained elevation.
These differences matter both for effects and for how the compound is used.
How It Works
Under normal physiology, GHRH from the hypothalamus signals the pituitary to release GH. GH then travels to the liver, where it triggers production of insulin-like growth factor 1 (IGF-1) — the downstream hormone responsible for most of GH's anabolic and recovery-promoting effects.
CJC-1295 mimics GHRH, binding to the same receptors and initiating the same cascade. Research published in the Journal of Clinical Endocrinology & Metabolism demonstrated that a single injection of CJC-1295 with DAC produced sustained increases in GH levels (2-10x above baseline) lasting 6 days, with IGF-1 remaining elevated for up to two weeks at higher doses.
Critically, CJC-1295 doesn't override the body's regulatory feedback mechanisms. Somatostatin — the hormone that naturally "brakes" GH release — still functions normally, which means GH levels amplify but don't run unchecked the way exogenous GH injections can.
Potential Benefits
Body Composition. Higher GH and IGF-1 levels shift the metabolic environment toward fat oxidation and lean tissue preservation. Studies have shown reductions in adipose tissue (particularly visceral fat) alongside modest increases in lean mass over 12-week periods.
Recovery and Sleep Quality. The largest natural GH pulse occurs during slow-wave (deep) sleep. CJC-1295 appears to enhance this pulse, which may explain the frequently reported improvement in sleep depth and morning recovery scores among users. Better deep sleep also means better memory consolidation and immune function.
Connective Tissue Repair. GH and IGF-1 play a significant role in collagen synthesis and tendon/ligament repair. This makes CJC-1295 of interest to people recovering from injuries or dealing with chronic joint issues.
Anti-Aging Effects. IGF-1 upregulation supports cellular regeneration broadly — skin quality, bone density maintenance, and cognitive function have all been studied in the context of GH restoration in older adults.
Common Protocols
CJC-1295 without DAC is typically dosed at 100–200 mcg and stacked with a GHRP like Ipamorelin (also 100–200 mcg), both administered subcutaneously 2-3x daily, with the most important dose being 30-60 minutes before sleep on an empty stomach.
CJC-1295 with DAC is typically dosed at 1-2 mg once or twice per week due to its long half-life.
Cycling is common: 12 weeks on, 4 weeks off.
Safety Considerations
The most frequently reported side effects are water retention (especially early on), carpal tunnel-like tingling in the hands, and temporary fasting blood glucose elevation. GH has known interactions with insulin signaling, so people with diabetes or insulin resistance should approach this area cautiously and with medical supervision.
CJC-1295 is not approved by the FDA for any indication and is classified as a research peptide in most countries. It is also on the World Anti-Doping Agency (WADA) prohibited list.
The Bottom Line
CJC-1295 is one of the cleaner tools for amplifying the body's natural GH axis — particularly appealing for people focused on recovery, body composition, and sleep quality. Its mechanism of action preserves physiological feedback loops in a way exogenous GH does not. That said, it's not a beginner supplement, and sourcing quality, purity-tested peptides is non-negotiable given the regulatory gray area it occupies.