CJC-1295 Reconstitution & Storage — Research Guide

CJC-1295 is a modified GHRH analogue available in two research forms: CJC-1295 No-DAC (Mod GRF 1-29, ~30 min half-life) and CJC-1295 with DAC (~8 day half-life via albumin binding) supplied as a lyophilized powder for laboratory research. Correct reconstitution and storage are the single biggest determinants of measured potency, peak concentration, and inter-experiment reproducibility when working with GHRH analogues. This guide compiles the reconstitution ratios, diluent choices, concentration tables, storage temperatures, and stability windows most commonly cited in the published research literature.

Reconstitution Reference

| Variant | Vial Size | BAC Added | Concentration | Vol for 100 mcg | Vol for 1 mg | | --- | --- | --- | --- | --- | --- | | No-DAC | 2 mg | 1.0 mL | 2.0 mg/mL | 0.05 mL (5 IU) | 0.50 mL (50 IU) | | No-DAC | 2 mg | 2.0 mL | 1.0 mg/mL | 0.10 mL (10 IU) | 1.00 mL (100 IU) | | No-DAC | 5 mg | 2.5 mL | 2.0 mg/mL | 0.05 mL (5 IU) | 0.50 mL (50 IU) | | With DAC | 2 mg | 2.0 mL | 1.0 mg/mL | 0.10 mL (10 IU) | 1.00 mL (100 IU) | | With DAC | 5 mg | 2.5 mL | 2.0 mg/mL | 0.05 mL (5 IU) | 0.50 mL (50 IU) | | With DAC | 5 mg | 5.0 mL | 1.0 mg/mL | 0.10 mL (10 IU) | 1.00 mL (100 IU) |

Variant-Specific Notes

• CJC-1295 No-DAC (Mod GRF 1-29): Short half-life, typically combined with a GHRP such as ipamorelin to mimic native GH pulse. Daily or twice-daily research dosing is the norm; lower-concentration reconstitution (1 mg/mL) eases small-volume draws.
• CJC-1295 with DAC: Drug Affinity Complex extends half-life via covalent binding to albumin in vivo. Once-weekly research dosing predominates. Higher concentration (2 mg/mL) is suitable because draw volumes are infrequent and small.

Reconstitution Procedure

1. Equilibrate vials to room temperature.
2. Disinfect rubber stoppers with 70% isopropanol.
3. Add BAC water slowly down the inner wall.
4. Do not shake. Swirl gently if needed.
5. Solution should be clear and colorless within 1–2 minutes.

Storage Reference

| State | Temperature | Stability Window | | --- | --- | --- | | Lyophilized, sealed (either variant) | 2–8 °C | 24 months (typical COA) | | Lyophilized, sealed (either variant) | –20 °C | 36+ months | | Reconstituted No-DAC in BAC | 2–8 °C | 14–28 days | | Reconstituted with DAC in BAC | 2–8 °C | 28–60 days | | Either variant, room temperature, reconstituted | <25 °C | 7–10 days |

The DAC modification confers measurably greater solution stability than the unmodified Mod GRF 1-29 fragment.

Common Reconstitution Errors

• Confusing the two variants. A No-DAC dose calculated as if it were DAC produces a 16× difference in expected serum exposure. Always confirm vial label and COA before reconstituting.
• Using over-aggressive swirling. GHRH analogues are sensitive to interfacial denaturation.
• Pooled CJC + GHRP storage. Some research practice combines CJC-1295 No-DAC with ipamorelin in a single reconstituted vial. This is acceptable for convenience but the stability window collapses to the shorter of the two peptides.

Concentration Worksheet

For combined CJC + GHRP stacks, label the working vial explicitly: peptide A mg/mL, peptide B mg/mL, reconstitution date, and the volume corresponding to each peptide's research dose.

Frequently Asked Questions

What diluent should be used to reconstitute CJC-1295? Bacteriostatic water (0.9% benzyl alcohol in sterile water) is the standard diluent across published research protocols. It preserves peptide integrity and inhibits microbial growth, supporting multi-day reuse from a single vial. Sterile water for injection (SWFI) is an acceptable alternative for single-use preparations but offers no antimicrobial protection.

How much bacteriostatic water do I add to a 5 mg vial? Reconstitution volume is a function of the desired working concentration, not a fixed rule. The concentration tables above show 1–2 mg/mL as the most commonly cited working range in the literature. Lower volumes give higher concentration (smaller draw volumes); higher volumes give lower concentration (larger, more accurate draw volumes for low-dose research).

How should the lyophilized powder be stored before reconstitution? Lyophilized CJC-1295 is stored at 2–8 °C in its original sealed vial, protected from light and moisture. For long-term storage beyond the COA's stated shelf life, –20 °C is acceptable for most research peptides. Always allow the vial to reach room temperature before opening to prevent condensation.

How long is reconstituted CJC-1295 stable? Refrigerated stability (2–8 °C) for solutions reconstituted in bacteriostatic water is the figure to use; specific windows are published on each batch's certificate of analysis (COA). General reference ranges from the peptide-stability literature appear in the storage table above. Avoid repeated freeze-thaw cycles, which are the most commonly cited cause of measurable potency loss.

What is the correct technique for adding diluent to the vial? Inject the bacteriostatic water slowly down the inner wall of the vial — never directly onto the lyophilized cake. Allow the powder to dissolve passively; do not shake. Gentle swirling is acceptable if dissolution is slow. Aggressive agitation introduces shear stress that can damage peptide tertiary structure.

How is dose volume calculated from the concentration table? Dose volume (mL) = research dose (mg) ÷ concentration (mg/mL). For insulin syringes marked in units (100 units = 1 mL), multiply the mL value by 100. Worked examples appear in the concentration tables above for the most common CJC-1295 research doses.

Can CJC-1295 be reconstituted in saline or other diluents? Bacteriostatic water remains the published standard. Saline reconstitution is documented in some clinical pharmacology references but is uncommon in independent research settings because it offers no preservative action. Avoid acidic or alkaline buffers unless explicitly required by an assay protocol — pH excursions accelerate peptide degradation.

What if the solution appears cloudy after reconstitution? A cloudy or particulate solution after correct reconstitution indicates either incomplete dissolution, contamination, or peptide aggregation. Do not use cloudy material for research; document the batch and request a replacement vial along with the relevant COA from the supplier.