Peptide Reconstitution Chart: BAC Water Amounts for Common Vial Sizes

A peptide reconstitution chart is a quick lookup that maps a vial size in milligrams plus the bacteriostatic (BAC) water you add to a final concentration in mg/mL. Concentration is what decides how many units you draw on a syringe, so a good chart turns the whole mixing question into reading one row. This page gives you that chart for the most common vial sizes, then shows the formula so you can build any mix the chart does not list.

This is a math and reference overview only. The peptides referenced here are research compounds, not approved for human consumption, and nothing below is a recommendation to use any compound or amount. Defer every decision to a licensed clinician and read the full disclaimer.

How to Read the Chart

Three numbers connect on every row. The vial mass is fixed. The BAC water you add is your choice. Together they set concentration:

• Concentration (mg/mL) = vial mg divided by BAC water mL
• Per unit (mg) = concentration divided by 100, since a U-100 insulin syringe has 100 units per mL
• Units to draw = target mg divided by per-unit mg

Peptide Reconstitution Chart (Common Vial Sizes)

Each row is a vial size mixed with a BAC water volume, giving the resulting concentration and how much sits in 1 unit on the syringe. Print it or screenshot it for the bench.

• 2 mg vial + 1 mL = 2 mg/mL, 0.02 mg per unit
• 2 mg vial + 2 mL = 1 mg/mL, 0.01 mg per unit
• 5 mg vial + 1 mL = 5 mg/mL, 0.05 mg per unit
• 5 mg vial + 2 mL = 2.5 mg/mL, 0.025 mg per unit
• 5 mg vial + 2.5 mL = 2 mg/mL, 0.02 mg per unit
• 10 mg vial + 1 mL = 10 mg/mL, 0.1 mg per unit
• 10 mg vial + 2 mL = 5 mg/mL, 0.05 mg per unit
• 10 mg vial + 5 mL = 2 mg/mL, 0.02 mg per unit
• 15 mg vial + 1.5 mL = 10 mg/mL, 0.1 mg per unit
• 15 mg vial + 3 mL = 5 mg/mL, 0.05 mg per unit
• 30 mg vial + 3 mL = 10 mg/mL, 0.1 mg per unit
• 30 mg vial + 6 mL = 5 mg/mL, 0.05 mg per unit

Notice the same concentration repeats across vial sizes. A 5 mg vial with 1 mL and a 10 mg vial with 2 mL are both 5 mg/mL, so they draw identically for the same target. The vial mass only changes how many total doses the vial holds, not the units per dose. To map any row to your exact target, the reconstitution calculator converts vial size, water, and target into a unit reading instantly.

Turning a Row Into Units

Pick a row, then divide your target by the per-unit value. Three quick examples using the chart:

1. 10 mg + 2 mL = 5 mg/mL. A 0.5 mg target: 0.5 divided by 0.05 = 10 units.
2. 5 mg + 2 mL = 2.5 mg/mL. A 0.25 mg target: 0.25 divided by 0.025 = 10 units.
3. 2 mg + 1 mL = 2 mg/mL. A 0.1 mg (100 mcg) target: 0.1 divided by 0.02 = 5 units.

If your target is in micrograms, convert first: 250 mcg is 0.25 mg. The mg to units converter handles that final syringe step, and the mcg to mg conversion guide covers the unit swap.

Choosing a BAC Water Volume

There is no single correct volume. More water lowers concentration and spreads a small target across more lines, which is easier to read. Less water keeps draws short. Three limits bound the choice:

• Syringe capacity. A standard insulin syringe holds 100 units (1 mL). If one draw exceeds 100 units, the vial is too dilute for that target.
• Vial headspace. A 2 mL vial cannot physically hold 5 mL. Match water volume to the vial.
• Solubility and stability. Some compounds tolerate only a narrow range. Product reference material and a clinician guide this, not a chart.

Building a Mix the Chart Does Not List

Say you have a 20 mg vial and want a 0.4 mg target to read at about 20 units. Work backward from the units you want:

1. Target units 20 means per-unit = 0.4 divided by 20 = 0.02 mg per unit.
2. Concentration = per-unit times 100 = 2 mg/mL.
3. BAC water = vial mg divided by concentration = 20 divided by 2 = 10 mL. That exceeds one syringe and most vials, so step up the concentration.
4. Try 5 mg/mL instead: water = 20 divided by 5 = 4 mL. A 0.4 mg target then reads 8 units, short but workable.

That reverse math is exactly what a calculator automates. For step-by-step mixing technique, see how to reconstitute peptides, and for compound-specific reference pages browse the peptide calculators.

This article is educational and not medical advice. No peptide here is approved for human use. Consult a licensed clinician before making any decision.