Question 1

How do I reconstitute a peptide?

Accepted Answer

Add bacteriostatic water to the lyophilized vial and let the powder dissolve without shaking hard. The amount of water sets the concentration: the same vial in less water is more concentrated. Enter the vial size in mg and the water volume in mL and the calculator shows the resulting mg/mL concentration.

Question 2

What does the syringe show?

Accepted Answer

It models a U-100 insulin syringe, where 100 units equal 1 mL and 1 unit is 0.01 mL. Set a volume by dragging the plunger or using the arrow keys, and the tool converts that draw into units, the volume in mL, the mass it contains, and how many such draws the vial yields. It is reconstitution and handling math, not a dosing recommendation.

Question 3

How is the concentration calculated?

Accepted Answer

Concentration is the vial content divided by the water volume. A 10 mg vial in 2 mL of water is 5 mg/mL. Reconstitute the same 10 mg vial in 1 mL and it is 10 mg/mL, so each syringe unit then carries twice the mass.

Question 4

How much water should I use?

Accepted Answer

There is no single right amount: more water gives a lower concentration and finer graduations on the syringe, less water gives a higher concentration. The calculator lets you try different volumes and see the mg/mL each one gives, so you can pick the concentration that reads most cleanly. Which diluent and storage suit a given compound are covered on its product page and certificate of analysis.

Question 5

How does it handle blends?

Accepted Answer

For a combination product the calculator splits each draw across the components by their share of the total mg, so you can see the mass of each component at the current volume. The parts always sum to the total.

Peptide Reconstitution Calculator

Reconstitution calculator: frequently asked questions