How to Reconstitute BPC-157 (Step by Step)

BPC-157 ships as a freeze-dried white powder. Before any dose math works, the vial has to be reconstituted, which means adding bacteriostatic water to dissolve the powder into a liquid of known strength. This is a lab handling reference for a research compound, not medical guidance. It covers how much water to add for the common 5mg and 10mg vials, why you swirl instead of shake, then hands the dose-per-unit math to a calculator.

The one idea that makes the rest easy: the milligrams in the vial never change. Adding water does not add or remove peptide. It only sets the concentration, which decides how many units sit on the syringe for a given dose. More water means a more dilute mix and more units to draw. Less water means a stronger mix and fewer units.

What you need on hand

• The BPC-157 vial (5mg and 10mg are the usual sizes)
• Bacteriostatic water, the standard diluent. See bacteriostatic water vs sterile water for why the bacteriostatic version suits multi-draw vials
• A larger syringe to transfer the water, plus U-100 insulin syringes for later draws
• Alcohol swabs and a clean, flat surface

The mixing steps

1. Let the vial and the water reach room temperature, then swab both rubber stoppers with alcohol.
2. Draw your chosen volume of bacteriostatic water into the transfer syringe (amounts below).
3. Insert the needle at an angle and let the water run slowly down the inner glass wall, not straight onto the powder.
4. Do not shake. Swirl gently or let it sit until the solution turns clear. Shaking forces air through the peptide and can stress the chain.
5. Refrigerate the reconstituted vial. See how to store peptides for handling after mixing.

Bacteriostatic water amounts by vial size

There is no single correct water volume. It is a choice that sets your concentration, which is total mg divided by total mL. Because BPC-157 doses are small (measured in micrograms), people often pick a water volume that makes the units land on round, easy-to-read marks. Here 1mcg = 0.001mg, so 1mg = 1000mcg.

5mg vial:

• 1mL water gives 5mg/mL (5000mcg/mL)
• 2mL water gives 2.5mg/mL (2500mcg/mL)

10mg vial:

• 1mL water gives 10mg/mL (10000mcg/mL)
• 2mL water gives 5mg/mL (5000mcg/mL)

A 5mg vial in 2mL is a popular reference mix because the numbers stay clean on a U-100 syringe, as the worked examples below show. For a fuller table across diluent volumes, see the peptide reconstitution chart.

Turning concentration into syringe units

On a U-100 insulin syringe, 100 units equals 1mL, so 1 unit equals 0.01mL. The reference formula is: units = (dose in mcg divided by concentration in mcg/mL) times 100. Keep dose and concentration in the same unit (both mcg) and the math stays clean.

Worked example with a 5mg vial mixed in 2mL, giving 2500mcg/mL. A reference dose figure of 250mcg would be (250 / 2500) x 100 = 10 units. A 500mcg figure would be (500 / 2500) x 100 = 20 units. Same vial, same water, the units just scale with the dose. For background on the unit-to-volume reading, see how to read an insulin syringe for peptides.

Rather than run this by hand each time, drop your vial mg, water volume, and target dose into the BPC-157 calculator. It returns the exact units to draw and the line to fill to. For the general method across any peptide, the reconstitution calculator covers the same math.

Common reconstitution mistakes

• Shaking the vial instead of swirling
• Spraying water straight onto the powder under pressure
• Mixing the milligrams of the vial with the micrograms of a dose, they are different numbers
• Assuming a 5mg and a 10mg vial draw the same units after the same water volume
• Forgetting to log the water amount, which turns every later unit reading into guesswork

For a deeper walkthrough of the general process, see how to reconstitute peptides, and for dose context once mixed, the BPC-157 dosage guide. BPC-157 is a research compound and is not approved for human consumption. Any decisions about use belong with a licensed clinician. Read the full disclaimer.