Smart Reconstitution Optimizer

Enter your vial size and dose; get the BAC water amounts that land your syringe draw on clean, round numbers that are easy to read.

Vial size (mg)
Desired dose
Syringe size
Leave blank to consider bottles up to 5 mL.
Optimize for

A standard reconstitution calculator asks "given my BAC water, how many units do I draw?" This optimizer flips it: it tries clean target draws (5, 10, 25, 50 units and so on) and tells you the BAC water that makes each one exact, then ranks them so you can pick the easiest draw to read or the smallest injection volume. Tap Use this on any recipe to open it in the full calculator with a syringe diagram.

Smart reconstitution optimizer reference

How the optimizer works

Reconstitution is a single relationship between four numbers: the vial mass, the dose, the BAC water you add, and the resulting draw on a U-100 syringe. Fix the vial and dose, and the draw is decided entirely by how much water you add. The optimizer walks a set of clean target draws and inverts the relationship to find the BAC water that lands exactly on each one:

BAC water mL = (draw units × vial mg) ÷ (dose mg × 100)

The ÷100 comes from the U-100 syringe, where 1 unit = 0.01 mL. Worked example: a 10 mg vial dosed at 2.5 mg, aiming for a 50-unit draw, needs (50 × 10) ÷ (2.5 × 100) = 2 mL of BAC water, which is also the cleanest, easiest mark to read.

Why a round draw matters

Insulin syringes are marked in whole units, and the gaps between marks are small. A draw that lands on 50 units is unambiguous; a draw of 47 or 53 units invites a misread, especially in poor light or with tired eyes. Choosing the BAC water so the dose falls on a round number removes that guesswork at every injection, which matters most when the same protocol is repeated many times.

Easier to read vs smaller volume

Easier to read favors larger, well-spaced draws that sit near the middle of the syringe and land on a 10- or 5-unit mark, even if that means injecting slightly more fluid. Smaller volume favors the least fluid per injection while still keeping the draw reasonably round. The optimizer also flags a round water amount when a recipe uses a tidy BAC volume like 1.0, 1.5, or 2.0 mL, which is simpler to measure into the vial.

Units & conversions

Doses are entered in micrograms or milligrams, where 1 mg = 1000 mcg. Syringe volume relates to draw as 1 mL = 100 units, so 0.01 mL = 1 unit. Vial concentration after reconstitution is the vial mass divided by the BAC water added, shown in mg/mL on each recipe.

BAC water on hand

If you only have a small bottle of bacteriostatic water, enter the amount you can spare and the optimizer restricts its recommendations to recipes that fit within it. Left blank, it considers practical bottle volumes up to 5 mL.

Data handling and privacy

The optimizer computes entirely in your browser. Nothing you enter is transmitted or stored; a share link simply encodes your inputs in the page address so the same result reopens.

Scope & safety

PepRecon is a research and education resource. This optimizer and reference material are provided for informational purposes and are not medical advice; they do not establish a dosing recommendation. Consult a qualified clinician before use.

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