The Basic Formula
Reconstitution concentration in milligrams per milliliter is calculated as:
Concentration (mg/mL) = Peptide mass (mg) ÷ Reconstitution volume (mL)
Example: A 5 mg vial reconstituted with 2 mL of bacteriostatic water yields 2.5 mg/mL.
Why Volume Matters
The peptide mass is fixed — it’s what’s lyophilized in the vial as documented on the COA. The variable is the reconstitution volume. More volume produces a lower concentration; less volume produces a higher concentration. The choice depends on the research protocol’s required dosing precision.
Choosing Reconstitution Volume
Common volume choices for research vials:
- 1 mL — highest concentration, smallest measurement volumes, requires precise syringe
- 2 mL — standard, balances concentration and measurement ease
- 3 mL — lower concentration, more forgiving measurement, longer-volume protocols
Calculating Volume for a Target Dose
Once reconstituted, calculate the volume needed for a specific research dose:
Volume needed (mL) = Target dose (mg) ÷ Concentration (mg/mL)
Example: From a 5 mg / 2 mL vial (2.5 mg/mL concentration), a 250 mcg dose requires: 0.25 mg ÷ 2.5 mg/mL = 0.1 mL = 100 µL.
Converting to Insulin Syringe Units
Insulin syringes are graduated in International Units (IU), where 100 IU = 1 mL. So:
IU on syringe = Volume needed (mL) × 100
Continuing the example above: 0.1 mL × 100 = 10 IU on the insulin syringe.
Blends and Combination Vials
Blend vials (such as CJC-1295 + Ipamorelin) require separate calculations for each component. A vial labeled “10 mg blend” containing 5 mg of each compound, reconstituted with 2 mL, yields 2.5 mg/mL of each component. The total peptide concentration is 5 mg/mL, but the research-relevant concentration is per-compound. Available blend products in Growth Hormone category.
Always Verify Against the COA
The peptide mass on the label is the design specification. The actual content for your specific batch is documented on the Certificate of Analysis. For research applications requiring precise dosing, calculate against the COA value, not the label value. See the full COA Library for batch records.
Storage after reconstitution: see our storage protocols for temperature and shelf-life guidance.