CJC-1295 vs Gonadorelin
A neutral, side-by-side comparison of two performance & growth hormone peptides — their mechanisms, dosing ranges, administration routes, side effects, and research evidence. For research and educational purposes only.
CJC-1295
CJC-1295 is a synthetic growth hormone-releasing hormone (GHRH) analog. It stimulates the pituitary gland to release growth hormone and is almost universally used in combination with a GHRP like Ipamorelin to produce a more physiological GH pulse.
Full profileGonadorelin
Synthetic form of endogenous gonadotropin-releasing hormone (GnRH) that stimulates LH and FSH release from the anterior pituitary. Used in TRT protocols to maintain testicular function and prevent atrophy during exogenous testosterone administration. Preserves spermatogenesis and endogenous testosterone production capacity.
Full profile| CJC-1295 | Gonadorelin | |
|---|---|---|
| Category | Performance & Growth Hormone | Performance & Growth Hormone |
| Also known as | CJC-1295 DAC, CJC-1295 without DAC (Mod GRF 1-29), Modified GRF 1-29 | GnRH, gonadotropin-releasing hormone, Factrel, Lutrepulse |
| Evidence | Research-stage | Research-stage |
| Dosing range | 100mcg–300mcg mcg, once daily (Mod GRF) or twice weekly (DAC version) | 50mcg–200mcg mcg, 2–3x per week subcutaneous |
| Administration | Subcutaneous injection (most common), Intramuscular injection | Subcutaneous injection, Intranasal (pulsatile delivery) |
| Key side effects | Water retention (especially early in protocol), Tingling or numbness in extremities, Injection site redness, Flushing (transient, shortly after injection) | Injection site reactions, Headache, Nausea, Flushing |
| Cited sources | 2 references | 2 references |
Key differences
- Administration: CJC-1295 — Subcutaneous injection (most common), Intramuscular injection; Gonadorelin — Subcutaneous injection, Intranasal (pulsatile delivery).
- Frequency: CJC-1295 is typically once daily (Mod GRF) or twice weekly (DAC version); Gonadorelin is 2–3x per week subcutaneous.
How each works
CJC-1295
Studies have demonstrated that CJC-1295 significantly increases plasma GH and IGF-1 levels. The DAC (Drug Affinity Complex) version extends the half-life to approximately 6–8 days via albumin binding, while Mod GRF 1-29 has a much shorter half-life (~30 minutes) and is dosed more acutely. Research in adults with GH deficiency has shown improved body composition and metabolic markers.
Gonadorelin
Gonadorelin directly binds GnRH receptors in the anterior pituitary to trigger LH and FSH secretion, which in turn stimulates Leydig cells for testosterone production and maintains spermatogenesis. Used as a TRT adjunct, pulsatile gonadorelin administration mimics natural hypothalamic GnRH to prevent testicular suppression associated with exogenous androgen use.
This comparison aggregates public research and structured profile data for informational purposes only. It is not medical advice and does not recommend either compound for human use. Consult a qualified healthcare provider before considering any peptide.