How to Reconstitute a Peptide: The Simple Steps

You have a little glass vial. Inside is dry peptide powder. You cannot use it dry. First you mix it with water. That is the easy part. This page shows you how. It also shows the simple math.

What “reconstitute” means

Reconstitute is a big word. It just means mix. You add water to the dry powder. The powder turns into liquid. Now you can use it. That is all it means.

The water has a name. It is called bacteriostatic water. It is just water with a tiny bit of stuff that keeps germs out. That way the vial stays clean for a while.

The one big rule

This is the most important part. The water does not add more peptide.

Say your vial has 5 mg of peptide. It stays 5 mg. It does not matter if you add a little water or a lot. The amount of peptide stays the same.

So what does the water change? It changes how strong the liquid is. More water makes it weaker. Less water makes it stronger. That is the only thing water changes.

Step 1: Find the strength

Strength means how much peptide is in each mL. (mL is just a way to measure liquid. Think of a tiny spoon.)

The math is one step:

Peptide ÷ water = strength.

Your vial has 5 mg. You add 2 mL of water. So 5 ÷ 2 = 2.5. The strength is 2.5 mg in each mL. Done.

Step 2: Find how much to draw

Now you know the strength. Next you find how much liquid to pull into the syringe.

The math is one step again:

Your dose ÷ strength = how much to draw.

Say your dose is 0.25 mg. The strength is 2.5. So 0.25 ÷ 2.5 = 0.1. You draw 0.1 mL. That is it.

Step 3: Read it on the syringe

The syringe has little lines on the side. These lines are called units. You need to know which line to stop at.

Most people use a U-100 syringe. On that one, 0.1 mL is the same as 10 units. So you pull the plunger to the line that says 10. That is where you stop.

The whole thing in one look

• Your vial: 5 mg of peptide
• You add: 2 mL of water
• Strength: 2.5 mg in each mL
• Your dose: 0.25 mg
• You draw: 0.1 mL, which is 10 units
• Doses in the vial: 20 (because 5 ÷ 0.25 = 20)

Do not want to do the math yourself? The free Preptide tool does it for you. You type in your numbers. It shows the answer.

More water or less water?

This part confuses people. So here it is, slow.

Add more water, and the liquid gets weaker. So you draw more units for the same dose. Some people like this. Bigger lines are easier to see.

Add less water, and the liquid gets stronger. So you draw fewer units.

But your dose does not change. Only the number of units changes. The peptide in your body is the same.

A quick safety note

This page only shows how the math works. It is not medical advice. We do not sell peptides. We do not tell you to take them. What you take, and if you take it at all, is between you and your doctor. Always check your numbers twice before you draw.