How do I work out what to draw on the syringe?

Divide the amount of peptide in the vial by the volume of bacteriostatic water you added to get the concentration per millilitre. Divide your target amount by that concentration to get the volume to draw, then multiply by 100 to convert millilitres to insulin-syringe units.

How many units are in 1ml?

100 units. Units are a universal insulin-syringe marking, so 1ml is 100 units and 0.1ml is 10 units on any insulin syringe.

Does adding more bacteriostatic water reduce the peptide?

No. A 10mg vial contains 10mg regardless of how much water you add. The water sets the concentration, which changes how much liquid you draw for a given amount, not how much peptide you have.

What if the result is more than 100 units?

A 1ml insulin syringe holds 100 units, so a result above that will not fit in one draw. Reconstituting with less water raises the concentration and brings the measurement back within a single draw.

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Calculator

Peptide reconstitution calculator

Enter your vial size, how much bacteriostatic water you added and the amount you want to draw. The measurement is marked on the syringe below.

Peptide in vial

Bac water added

Amount to draw

10units on a 1ml insulin syringe

That is 0.1ml, drawn from a vial at 5mg per ml.

liquid drawn your measurement syringe shown: 1ml / 100 units

Concentration

5 mg/ml

Per unit

0.05 mg

Draws per vial

Units in vial

200 units

The maths behind it

Three steps, and the calculator is just doing them for you:

Concentration. Peptide in the vial ÷ water added. A 10mg vial with 2ml of water is 5mg per ml.
Volume to draw. Your target amount ÷ concentration. 0.5mg at 5mg/ml is 0.1ml.
Convert to units. Multiply millilitres by 100. 0.1ml is 10 units.

Adding more water does not reduce the peptide. A 10mg vial holds 10mg whether you add 1ml or 5ml. More water simply spreads it through more liquid, so you draw a larger volume for the same amount, which can make small measurements easier to read.

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Units and millilitres

Insulin syringes are marked in units, not millilitres. A unit is the same on every insulin syringe, so these hold whatever syringe you use:

Volume	Units
0.1ml	10 units
0.25ml	25 units
0.5ml	50 units
1ml	100 units
2ml	200 units
5ml	500 units

If your result won't fit

A 1ml insulin syringe holds 100 units. If the calculator returns more than that, the measurement will not fit in one draw. Reconstituting with less bacteriostatic water raises the concentration and brings it back inside a single draw.

The opposite problem is a result so small it sits below the finest marking, under about 2 units is hard to read accurately. More water lowers the concentration and spreads the same amount across a larger, easier-to-measure volume.

Common questions

Does it matter how much water I add?: Only for convenience. It sets how much liquid you draw for a given amount of peptide, which determines how easy that measurement is to read on the syringe.
Why does my vial say 10mg but the calculator shows mg per ml?: The vial label is the total quantity of peptide. Concentration is that total divided by the liquid you added, and it is the number that matters once you are drawing from it.
Can I add more water later?: Adding water to a partly used vial changes the concentration of everything left in it, so your earlier measurements no longer apply. Work it out again from the new total volume.
What syringes does this assume?: The syringe drawn is the 1ml, 100 unit insulin syringe Evra supplies. Units are universal across insulin syringes, so the number of units is the same whatever syringe you use.

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Bac water, syringes and wipes

Everything for reconstitution, shipped with your order.

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For research use only. This calculator performs a unit conversion on values you enter. It does not recommend an amount, and nothing here is medical advice, a dosing recommendation, or a claim of any effect in humans. Evra Peptides products are supplied strictly for laboratory research and are not for human or veterinary consumption, nor for diagnostic or therapeutic use. You must be 18 or over to order.