When you stop taking CJC-1295, your growth hormone and IGF-1 levels gradually decline back toward your natural baseline over a period of days to weeks, depending on which version you were using. The drop isn’t instant. After multiple doses, IGF-1 levels can remain elevated above baseline for up to 28 days after your last injection, giving your body a tapering window rather than a sudden cliff.
How Quickly Hormone Levels Drop
The timeline depends heavily on whether you were using CJC-1295 with DAC or without DAC (sometimes called Mod GRF 1-29). The DAC version has a half-life of 6 to 8 days, meaning the peptide itself lingers in your system for well over a week after your last injection. The non-DAC version has a half-life of roughly 30 minutes, so the compound clears your body within hours.
But the peptide clearing your system and your hormone levels returning to normal are two different things. After a single injection of CJC-1295, growth hormone levels rise anywhere from 2 to 10 times their normal range and stay elevated for 6 days or more. IGF-1, which is produced downstream when your liver responds to that growth hormone surge, rises 1.5 to 3 times above baseline and stays elevated for 9 to 11 days after just one dose. After repeated dosing over weeks or months, those IGF-1 levels can remain above your pre-treatment baseline for up to 28 days. So even after you stop, there’s a meaningful hormonal tail.
What You’ll Actually Notice
The changes you experience will mirror the benefits you gained, just in reverse. If CJC-1295 improved your sleep quality, body composition, recovery from exercise, or skin appearance, those effects will fade as your growth hormone output settles back to its natural level. This doesn’t happen overnight. Most people describe a gradual return to how they felt before starting, not a dramatic crash.
Unlike stopping testosterone or anabolic steroids, stopping CJC-1295 doesn’t suppress your body’s own hormone production. The peptide works by stimulating your pituitary gland to release more of its own growth hormone rather than replacing it with an external source. This is a critical distinction. Your pituitary doesn’t shut down while you’re using CJC-1295 the way your testes would on exogenous testosterone. So when you stop, your natural growth hormone pulses continue. They simply return to whatever your baseline was before you started.
That said, if you’d grown accustomed to the elevated levels, your normal baseline may feel like a noticeable step down. People commonly report changes in energy, slower recovery after workouts, and a gradual shift in body composition over the weeks following discontinuation. Fat loss that seemed easier on the peptide may plateau or reverse if diet and training stay the same.
Receptor Sensitivity and Tolerance
One reason people cycle off CJC-1295 is to maintain receptor sensitivity. Your pituitary gland responds to growth hormone-releasing hormone (GHRH) through specific receptors, and continuous stimulation can dull that response over time. This is sometimes called desensitization or downregulation. If you’ve been using CJC-1295 steadily for months and noticed the effects weakening, that’s likely what’s happening.
Taking time off allows those receptors to reset. The typical approach is cycling off for a period proportional to how long you were on. There’s no universally agreed-upon protocol since CJC-1295 hasn’t gone through standard FDA approval trials for this use, but many practitioners suggest off-periods of 4 to 8 weeks. Given that IGF-1 levels can remain above baseline for up to 28 days after your last dose, a minimum of 4 weeks off makes physiological sense as a starting point for receptor recovery.
DAC vs. Non-DAC: Different Discontinuation Profiles
If you were using the DAC version, expect a slower, more gradual return to baseline. The long half-life of 6 to 8 days means the peptide is still active in your body for roughly 3 to 4 weeks after your final injection (it takes about 4 to 5 half-lives for a drug to fully clear). Your hormone levels will taper down smoothly during this period.
If you were using the non-DAC version (Mod GRF 1-29), the compound itself is gone within a few hours. However, the hormonal effects still outlast the peptide. Growth hormone pulses return to their natural pattern within a day or two, but the downstream IGF-1 elevation persists for over a week even after a single dose. After extended use, this tail can stretch considerably longer. The non-DAC version does offer a cleaner break, since there’s no lingering peptide activity to account for, which is one reason some users prefer it for more precise cycling.
Body Composition and Performance Changes
The most noticeable long-term effect of stopping is usually a shift in body composition. Elevated growth hormone promotes fat metabolism and supports lean muscle maintenance. When those levels return to baseline, your body’s default set point reasserts itself. How much change you see depends on factors like your age, diet, exercise routine, and how far your natural growth hormone production has declined (growth hormone output drops roughly 15% per decade after age 30).
If you built muscle or lost fat while on CJC-1295, you won’t lose those gains immediately. Muscle doesn’t disappear because a peptide leaves your system. But maintaining that physique may require more effort in training and nutrition than it did while your growth hormone levels were artificially elevated. Recovery between workouts typically slows, which can indirectly affect your training volume and progress over time.
Sleep quality is another area where people notice the change. Growth hormone is released primarily during deep sleep, and CJC-1295 amplifies those pulses. Some users report that sleep feels lighter or less restorative after stopping, though this is subjective and varies widely.
Is Post-Cycle Therapy Needed?
No. Unlike anabolic steroids, CJC-1295 doesn’t suppress your hypothalamic-pituitary axis in a way that requires pharmaceutical intervention to restart. Your body’s natural growth hormone production continues throughout use and after discontinuation. There’s no need for a recovery protocol with additional drugs. The main consideration is simply giving your receptors enough time off to regain full sensitivity before starting another cycle.