CJC-1295 + GHRP-6 Stack vs Mod-GRF(1-29)
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 + GHRP-6 Stack
CJC-1295 (GHRH analog) combined with GHRP-6 (potent ghrelin receptor agonist) to produce synergistic GH release via complementary mechanisms. GHRP-6's strong appetite stimulation distinguishes this from the CJC-1295 + Ipamorelin stack, making it preferred for bulking and mass-gaining protocols where caloric surplus is the goal. Produces larger GH pulses than CJC + Ipamorelin but with more pronounced appetite effects.
Full profileMod-GRF(1-29)
Mod-GRF(1-29) is a stabilized analog of growth hormone-releasing hormone (GHRH) that spans residues 1–29 of the native peptide. Unlike CJC-1295 (which includes a Drug Affinity Complex for multi-day half-life), Mod-GRF(1-29) has a short ~30-minute active window — mimicking the natural GHRH pulse pattern. It is the preferred GHRH component for precise, pulsatile GH protocols when combined with a GHRP.
Full profile| CJC-1295 + GHRP-6 Stack | Mod-GRF(1-29) | |
|---|---|---|
| Category | Performance & Growth Hormone | Performance & Growth Hormone |
| Also known as | CJC GHRP-6 combination, GH releasing stack, GHRH GHRP combination, CJC-1295 GHRP-6 | Modified GRF(1-29), CJC-1295 without DAC, Tetrasubstituted GRF, Sermorelin analog |
| Evidence | Research-stage | Research-stage |
| Dosing range | CJC-1295 100mcg + GHRP-6 100mcg–CJC-1295 200mcg + GHRP-6 300mcg mcg, 1–3x daily (pre-sleep, pre-workout, morning) | 100mcg–200mcg mcg, 2–3x daily, co-administered with a GHRP (pre-sleep, pre-workout, and/or upon waking) |
| Administration | Subcutaneous injection | Subcutaneous injection, Intramuscular injection |
| Key side effects | Strong appetite stimulation (GHRP-6 dominant effect), Water retention, Tingling / numbness in extremities, Mild cortisol elevation (GHRP-6 is less selective than ipamorelin) | Water retention (mild, dose-dependent), Tingling / numbness in extremities (carpal tunnel-like at high doses), Increased appetite (via GHRP component — less with Mod-GRF alone), Flushing or warmth at injection site |
| Cited sources | 2 references | 2 references |
Key differences
- Administration: CJC-1295 + GHRP-6 Stack — Subcutaneous injection; Mod-GRF(1-29) — Subcutaneous injection, Intramuscular injection.
- Frequency: CJC-1295 + GHRP-6 Stack is typically 1–3x daily (pre-sleep, pre-workout, morning); Mod-GRF(1-29) is 2–3x daily, co-administered with a GHRP (pre-sleep, pre-workout, and/or upon waking).
How each works
CJC-1295 + GHRP-6 Stack
The GHRH + GHRP combination synergistically amplifies GH pulse amplitude compared to either agent alone. CJC-1295 elevates baseline GH via GHRH receptor signaling at the pituitary; GHRP-6 triggers pulse timing via GHS-R1a. GHRP-6's potent appetite stimulation (significantly stronger than ipamorelin) makes this combination preferred in protocols targeting caloric surplus and mass accumulation.
Mod-GRF(1-29)
Native GHRH(1-29) is rapidly cleaved by plasma dipeptidyl peptidase IV (DPP-IV) within 2–3 minutes. Mod-GRF(1-29) incorporates four amino acid substitutions (positions 2, 8, 15, 27) that resist DPP-IV degradation, extending the half-life to approximately 30 minutes while preserving GHRH receptor binding affinity. This creates a half-life window aligned with physiological GH pulsatility, making it suitable for 2–3x daily injections that mimic natural GH release patterns.
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.