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Need help? Text us, and a team member will reply in mins +1 (917) 694-3619
Need help? Text us, and a team member will reply in mins +1 (917) 694-3619
Accurate, research only calculations for lyophilised peptides and solution volumes.
The Healius peptide reconstitution calculator is built to do three things in a single tool. First, it works out how much bacteriostatic water to inject into a lyophilized peptide vial based on the total peptide weight and the target draw concentration. Second, it converts your target peptide dose, in mcg or mg, into the exact volume of reconstituted peptide solution you draw into an insulin syringe, in mL and IU. Third, it reports the percentage of the syringe each draw represents, so you can cross-check the scale mark visually before drawing.
The calculator is a four-step flow. Step one selects your insulin syringe capacity (1 mL, 0.5 mL or 0.3 mL). Step two selects the total peptide mass in the vial, from 1 mg through 500 mg. Step three sets the desired peptide amount you want to draw in a single measurement, in mcg or mg. Step four sets the volume of bacteriostatic water you plan to inject into the vial, in mL. Press Calculate and the tool returns the exact syringe draw in mL and IU, plus a visual meter showing where to stop on the syringe scale. Hit Reset Calculator to start a new calculation.
Reconstituting research peptides always involves four measurement units: milligrams (mg) and micrograms (mcg) for peptide mass, millilitres (mL) for reconstituted solution volume, and International Units (IU) for syringe draw reading on a U-100 insulin syringe. One milligram equals 1,000 micrograms. On a U-100 insulin syringe, 1 mL equals 100 IU, so every 0.01 mL of solution reads as 1 IU on the syringe scale.
To convert mg to mcg, multiply the mg value by 1,000. To convert mcg to mg, divide by 1,000. To convert a target mcg dose in a reconstituted vial into syringe IU, multiply your target mcg by the mL of bacteriostatic water added, divide by the total peptide mass in mcg, then multiply by 100 to get IU. The calculator runs this math for you, but the underlying formulas are the same whether you run it by hand or by tool.
Example 1: a 10 mg peptide vial reconstituted with 2 mL of bacteriostatic water. The concentration of the reconstituted solution is 10 mg divided by 2 mL, which equals 5 mg per mL, or 5,000 mcg per mL. For a 500 mcg research draw, the draw volume is (500 divided by 5,000) times 1 mL, which equals 0.1 mL. On a U-100 insulin syringe, 0.1 mL reads as 10 IU.
Example 2: a 5 mg peptide vial reconstituted with 1 mL of bacteriostatic water. The concentration of the reconstituted solution is 5 mg divided by 1 mL, which equals 5 mg per mL, or 5,000 mcg per mL. For a 250 mcg research draw, the draw volume is (250 divided by 5,000) times 1 mL, which equals 0.05 mL. On a U-100 insulin syringe, 0.05 mL reads as 5 IU.
For any vial size or target draw not covered by these two examples, use the calculator above. The tool handles every vial weight from 1 mg to 500 mg and any bacteriostatic water volume up to 10 mL.
The syringe should match the size of the draw volumes you plan to take. For most research peptides reconstituted at 5 to 10 mg per mL, a 1 mL U-100 insulin syringe works well: it gives 100 IU of resolution across the full mL and reads every single IU as a clear scale mark. For very small research draws that resolve below 5 IU, a 0.3 mL syringe gives finer control of the draw. For larger research draws, a 1 mL syringe avoids the need to split a draw across multiple measurements.
The bacteriostatic water volume governs the concentration of the reconstituted solution and therefore the draw resolution. Adding more bacteriostatic water produces a more dilute solution, a larger draw volume per dose and more precision on the syringe scale. Adding less bacteriostatic water produces a more concentrated solution, a smaller draw per dose and extends the vial across more research sessions. Most researchers reconstitute a 5 mg vial with 1 mL to 2 mL of bacteriostatic water and a 10 mg vial with 2 mL to 3 mL. The calculator supports any volume you choose. For full handling and storage detail, see our reconstitution storage guide.
Inject the specified volume of bacteriostatic water into the peptide vial slowly, running the stream down the inside wall of the vial so it does not strike the lyophilized pellet directly. Do not shake. Gently swirl the vial for 30 to 60 seconds until the peptide fully dissolves. Small amounts of peptide that do not dissolve immediately usually clear within 5 to 10 minutes at room temperature. Full step by step handling guidance is on our reconstitution storage page.
The calculator works across 1 mL, 0.5 mL and 0.3 mL U-100 insulin syringes. The IU value in the results block is calibrated against a U-100 syringe, where 100 IU equals 1 mL. If you use a non-U-100 syringe, use the mL draw value and cross-check against the scale on your specific syringe.
Multiply the milligram value by 1,000. One milligram equals 1,000 micrograms. So 5 mg equals 5,000 mcg, 10 mg equals 10,000 mcg, and 500 mcg equals 0.5 mg.
mL (millilitres) is a unit of liquid volume. IU (International Units) is the scale marking on a U-100 insulin syringe, where 100 IU equals 1 mL. Every 0.01 mL of solution is 1 IU on the scale. The calculator reports both so you can cross-check the syringe scale mark visually before drawing.
Yes. The calculator is weight-based and applies to any lyophilized peptide at any vial size and any bacteriostatic water volume. It does not model peptide-specific solubility limits or reconstitution buffer choice. If a peptide requires acetic acid or a different reconstitution solvent rather than plain bacteriostatic water, the calculator still returns the correct volume calculations for that substituted solvent.
Yes. The calculator works for any lyophilized peptide from any supplier. You enter the vial weight, the bacteriostatic water volume you want to add and the target draw amount, and the tool returns the exact syringe volume. For Healius peptides, the vial weight on the label matches the peptide mass you enter in Step 2 of the calculator.
