The verdict
Our read at a glance.
Whether CJC-1295 with DAC, which raises growth hormone and IGF-1 in early studies, produces the muscle, fat-loss, and recovery benefits marketed for it.
- The signal
- A small early study in healthy adults showed CJC-1295 with DAC produces a sustained rise in growth hormone and IGF-1 lasting several days per dose. There are no controlled trials testing whether that translates into changes in body composition, strength, recovery, or long-term safety.
- The unknown
- Whether the sustained rise in growth hormone and IGF-1 does anything useful or is safe over time, since chronically elevated IGF-1 carries its own theoretical risks.
- Our read
- Real but shallow human pharmacology, no outcome evidence. CJC-1295 with DAC clearly raises growth hormone and IGF-1 for days, but no study shows that helps body composition or recovery, and its safety over time is unknown.
The mechanism
How it works.
CJC-1295 is a modified fragment of growth-hormone-releasing hormone, the brain signal that tells the pituitary to release growth hormone. The DAC, or drug affinity complex, is a chemical group that attaches the peptide to albumin in the blood so it is not cleared within minutes, stretching its action to several days. While bound, it keeps prompting the pituitary, producing a sustained rise in growth hormone and IGF-1. This pharmacology is documented in a small human study, but whether that pattern of stimulation is useful or safe over the long term has not been established.
Safety & regulatory boundary
The consequential part.
CJC-1295 with DAC is not an approved medicine and is sold as a research chemical, where identity, purity, and dose are uncertain. Its only human data is a short pharmacology study, not evidence of benefit. Sustained elevation of growth hormone and IGF-1 is not the same as a proven therapy, and the long-term safety of pushing these hormones up for months or years has not been studied.
What's next
What we're watching.
Whether any controlled trial ever tests it for an actual outcome rather than just hormone levels, and any long-term safety data on sustained IGF-1 elevation.
Context
Why this is discussed.
It promises the effects of growth hormone from an infrequent injection by pushing the body to make its own, which appeals to people seeking muscle, fat loss, and anti-aging effects.
The evidence base
13 cited references.
Registered trials1
ClinicalTrials.gov · PHASE2 · TERMINATED · 2005-12
Indexed literature (PubMed)12
Teichman SL et al. · J Clin Endocrinol Metab · 2006
Rahman OF et al. · J Am Acad Orthop Surg Glob Res Rev · 2026
Mayfield CK et al. · Am J Sports Med · 2026
Van Hout MC et al. · Subst Use Misuse · 2016
Memdouh S et al. · Drug Test Anal · 2021
Alba M et al. · Am J Physiol Endocrinol Metab · 2006
Ionescu M et al. · J Clin Endocrinol Metab · 2006
Jetté L et al. · Endocrinology · 2005
Timms M et al. · Drug Test Anal · 2019
Henninge J et al. · Drug Test Anal · 2010
Timms M et al. · Drug Test Anal · 2019
Russo SC et al. · AIDS · 2024
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