CJC-1295 / Ipamorelin reconstitution protocol

This protocol describes the reconstitution and storage of lyophilized CJC-1295 + Ipamorelin blended vials in standard research workflows. The two compounds are co-formulated because they target complementary growth-hormone-axis receptors and are typically studied together. Values below are derived from published handling literature; experimental design parameters are the responsibility of the qualified investigator.

At a glance

Parameter	Value
Recommended diluent	Bacteriostatic Water (USP, 0.9% benzyl alcohol)
Recommended volume (10 mg vial, 5 mg CJC-1295 + 5 mg Ipamorelin)	2.0 mL
Final concentration	2.5 mg/mL CJC-1295 + 2.5 mg/mL Ipamorelin (5 mg/mL combined compound)
Stability — lyophilized	≥24 months at -20 °C, light-protected, sealed
Stability — reconstituted	30 days at 2–8 °C in original vial

Procedure

1. Equilibrate. Allow vial to reach room temperature.
2. Sterile prep. Wipe stopper with isopropyl. Use sterile syringe + needle.
3. Inject diluent slowly along the inner wall. Both compounds dissolve readily.
4. Swirl gently. Do not shake. Cake dissolves within 30–60 seconds.
5. Verify. Solution should be clear and colorless.

Why the two compounds are blended

CJC-1295 (without DAC) is a synthetic analog of growth-hormone-releasing hormone (GHRH) — it stimulates the pituitary to release endogenous growth hormone. Ipamorelin is a selective growth-hormone secretagogue (GHRP) that activates the ghrelin receptor (GHS-R1a), also stimulating GH release through a complementary pathway. The combination provides a synergistic signal to the pituitary in research models: the two compounds activate different receptors that converge on the same downstream effect, producing a larger and more physiologically-shaped GH pulse than either alone.

Importantly, Ipamorelin is more selective than older GHRPs (like GHRP-2 or GHRP-6) — it does not meaningfully elevate cortisol or prolactin in published studies, which is why it became the preferred GHRP for research combinations.

Storage

Reconstituted blend is stable for approximately 30 days at 2–8 °C in the original vial. For longer storage, aliquot into sterile single-use tubes and freeze at -20 °C or colder. Avoid freeze-thaw on reconstituted material. Lyophilized stability is ≥24 months at -20 °C light-protected.

Notes

This protocol describes reconstitution parameters used in published compound-handling literature. It is not a recommendation for any particular study design. For research use only. Not for human or veterinary use.

References

1. Teichman SL, Neale A, Lawrence B, et al. Prolonged stimulation of growth hormone (GH) and insulin-like growth factor I secretion by CJC-1295, a long-acting analog of GH-releasing hormone, in healthy adults. J Clin Endocrinol Metab 2006;91:799–805. PMID: 16352683
2. Raun K, Hansen BS, Johansen NL, et al. Ipamorelin, the first selective growth hormone secretagogue. Eur J Endocrinol 1998;139:552–561. PMID: 9849822