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Therapept

Stack · Growth-hormone axis

CJC-1295 + Ipamorelin

Discussed as a GHRH-analogue plus GH-secretagogue pairing intended to stimulate GH release through two pathways at once — the “synthetic GH axis” pairing. The rationale appears in vendor and community material; the pharmacology of each pathway is real, but the pairing itself was not studied in the indexed literature.

Compounds

  • CJC-1295

    Growth hormone-releasing hormone (GHRH) analogue

    No FDA-approved product

  • Ipamorelin

    Growth hormone secretagogue

    No FDA-approved product

Why people combine them

Discussed as a GHRH-analogue plus GH-secretagogue pairing intended to stimulate GH release through two pathways at once — the “synthetic GH axis” pairing. The rationale appears in vendor and community material; the pharmacology of each pathway is real, but the pairing itself was not studied in the indexed literature.

Biological Mechanism ComparisonDual GH Secretagogue Axis · Single-Agent Trials Only
CJC-1295 (GHRH Analog)• Binds GHRH receptors• Stimulates cAMP / PKA pathway• Enhances GH synthesis & pulse heightIpamorelin (Ghrelin Mimetic)• Binds GHSR-1a (ghrelin receptor)• Triggers PLC/IP3 & intracellular Ca²⁺• Direct granule exocytosis (selective)Anterior Pituitary SomatotrophPathway 1 (GHRH): GH Production+ Pathway 2 (GHSR): GH Release→ Pulsatile Endogenous GH SurgeHuman Evidence Status!Single Agents Tested OnlyCJC-1295 DAC: trials haltedIpamorelin: IV phase 2 haltedFDA 503B Category 2WADA S2.2.4 Prohibited
Why enthusiasts pair them: GHRH triggers the production of growth hormone inside pituitary cells, while the ghrelin receptor agonist opens the gates to release it. Together they create larger natural pulses without shutting down the pituitary axis like synthetic HGH can.
Critical distinction: Most community stacks use "Mod GRF 1-29" (short half-life, ~30 min) rather than CJC-1295 DAC (long half-life, ~6–8 days). Combining them into an unregulated home injection lacks formal toxicology or dosing trial data.

Evidence for the combination

Components indexed separately

No direct combination study is currently indexed by Therapept. What exists is evidence for each component separately — which is not evidence that combining them adds anything.

Evidence for each component

  • CJC-1295 — Human interventional evidence exists for the DAC form (GH/IGF-I elevation, healthy adults, placebo-controlled). Development did not produce an approved drug; a later-trial death is recorded in reviews as a development event.
  • Ipamorelin — Human PK/PD evidence in volunteers; selectivity profile from preclinical work. On FDA's active 503B Category 2 compounding-risk table.

Commonly reported dosing and protocols

Displayed source by source. Therapept does not compose these into a recommended protocol.

  • COMMUNITYReddit / forums (recurring)

    Posts commonly describe blended subcutaneous injections on daily or five-days-on/two-off schedules, with CJC-1295 quoted per-µg and ipamorelin per-µg amounts that vary widely between threads.

    Reported practice with no primary-source anchor; quantities are not reproduced here as a protocol.

    Checked 17 September 2026 · Community sources — see the dosing reference for limitations

Potential overlap and concerns

  • CJC-1295's FDA compounding entry references serious adverse events (increased heart rate, systemic vasodilatory reaction); ipamorelin sits on the active 503B Category 2 table.
  • Both are WADA-prohibited (S2.2.4, GHRH analogues and GH secretagogues).
  • The human CJC-1295 evidence concerns the DAC molecule; most community stacks refer to the non-DAC fragment, which lacks that evidence.

What is known

  • Each molecule has published human pharmacology data as a single agent (DAC-CJC-1295; ipamorelin IV PK/PD).
  • FDA has published compounding-risk classifications for both.

What is speculative

  • Any advantage of co-administration — no indexed human study tests the pairing.
  • Synergy or reduced-side-effect claims.

Last reviewed 17 September 2026 · Compiled by Therapept Editorial · How these records are built