CJC-1295 Reconstitution Calculator
Enter your vial size, bacteriostatic water, and dose to get your exact draw in insulin syringe units.
Reconstitution calculator
Enter your peptide amount, diluent volume, and target dose to see your draw.
Nothing leaves your device.
Draw 0.10 ml (10 units on a U-100 insulin syringe) for a 250 mcg dose.
Mixing CJC-1295: What to Know Before You Reconstitute
CJC-1295 is a growth hormone releasing hormone analog sold as a lyophilized powder, most commonly in 2 mg and 5 mg vials. It exists in two forms that matter for mixing: with DAC and without DAC (the latter often labeled mod GRF 1-29). Both reconstitute the same way, but they are dosed on different schedules, which affects how long a vial stays in service. CJC-1295 is also the most commonly paired peptide in the GH-axis category, usually alongside ipamorelin, and that pairing introduces its own mixing question covered below.
Bacteriostatic water vs. sterile water
Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits bacterial growth after the vial is punctured. Sterile water, having no preservative, is generally treated as single use. CJC-1295 vials are drawn from repeatedly over days or weeks, so bacteriostatic water is the standard choice.
How much water to add
Water volume changes concentration, not content. A 5 mg vial contains 5 mg regardless. Because CJC-1295 doses are typically in the microgram range, the draws are small, and the water volume you choose largely determines whether those draws land on readable syringe markings.
Vial Water Concentration Per unit 100 mcg draw 200 mcg draw 2 mg 1 mL 2.0 mg/mL 20 mcg 5 units 10 units 2 mg 2 mL 1.0 mg/mL 10 mcg 10 units 20 units 5 mg 2 mL 2.5 mg/mL 25 mcg 4 units 8 units 5 mg 2.5 mL 2.0 mg/mL 20 mcg 5 units 10 units The pattern worth noticing: more water produces larger, easier to read draws for small doses. A 4 unit draw on a 100-unit syringe with 2-unit markings is workable but tight; at 10 units the same dose is far easier to measure accurately. The calculator above flags this directly when a draw falls below a comfortable threshold.
Mixing technique
Run the water down the inside wall of the vial rather than directly onto the powder, then swirl gently or let it sit until dissolved. Do not shake. The solution should be clear when fully dissolved. GH-axis peptides in general are handled gently, and CJC-1295 is no exception.
Storage before and after mixing
Lyophilized vials keep cool and dark before mixing. After reconstitution the vial is refrigerated, with the usual 28 day discard convention drawn from punctured bacteriostatic water. Since CJC-1295 without DAC is often dosed more frequently than the DAC version, how quickly a vial is consumed varies considerably between the two, so the mix date rather than the fill level is what people track.
The syringe
U-100 insulin syringes, with 100 units to 1 mL. Because the draws are small, the 0.3 mL 30-unit and 0.5 mL 50-unit syringes are genuinely useful here: their markings are spread further apart, which makes a 5 or 10 unit draw easier to read accurately than on a 1 mL syringe.
Common mistakes worth avoiding
The frequent ones: confusing the DAC and non-DAC versions when following a dosing schedule, using so little water that doses land on 2 or 3 units where small errors matter proportionally more, attempting to reconstitute CJC-1295 and ipamorelin into a single vial, mixing up mcg and mg during conversion, and carrying an old unit count over to a new vial mixed at a different volume.
FAQ
How much bacteriostatic water do I mix with a 5 mg CJC-1295 vial?
Can I mix CJC-1295 and ipamorelin in the same vial?
Is CJC-1295 with DAC mixed differently than without DAC?
How long does reconstituted CJC-1295 last in the fridge?
What size syringe do people use for CJC-1295?
PepKit's calculator is an arithmetic tool for reconstitution math. It does not provide dosing recommendations or medical advice. Follow the guidance of your provider or protocol.