How to Reconstitute BPC-157: A Step-by-Step Researcher's Guide

BPC-157 (Body Protection Compound-157) is a stable pentadecapeptide derived from a protein in human gastric juice. It's one of the most-ordered research peptides on the market, and it's also one of the most commonly mishandled at the reconstitution step. This guide walks through the process from a sealed vial to a properly diluted research solution, with worked examples for the two most common vial sizes we ship.

For research purposes only. Not for human consumption. The procedures described here are for in-vitro laboratory work, not medical use.

What you need before you start

Before you open the vial, gather your materials:

1. A sealed BPC-157 vial — typically 5mg or 10mg lyophilized powder
2. Bacteriostatic water — sterile water with 0.9% benzyl alcohol as a preservative. Do not substitute plain sterile water for multi-use applications, since it has no preservative
3. A 1mL (100-unit) insulin syringe — the standard for measuring small volumes precisely
4. 70% isopropyl alcohol swabs — to wipe the rubber stopper before puncturing
5. A clean, dust-free work surface — ideally a laminar flow hood for sterile work, but a wiped-down bench is acceptable for non-sterile research applications

If you don't already have bacteriostatic water, add a vial to your order — most researchers go through it faster than they expect.

The reconstitution math

The math for any peptide reconstitution is the same:

Total mcg in vial = Peptide mg × 1000
Concentration (mcg/mL) = Total mcg ÷ Bac water volume (mL)
mcg per syringe unit = Concentration ÷ 100

For example, a 5mg BPC-157 vial reconstituted with 2mL of bacteriostatic water:

• Total mcg in vial: 5,000
• Concentration: 5,000 / 2 = 2,500 mcg/mL
• Per syringe unit: 2,500 / 100 = 25 mcg per unit

So if you wanted to draw 250 mcg for a research dose, you would draw 10 units on a 1mL insulin syringe (10 × 25 = 250 mcg).

Our reconstitution calculator does this math for you and includes a visual syringe so you can double-check your draw before you commit. We strongly recommend using it instead of doing the arithmetic by hand — most reconstitution errors happen at the math step, not the physical step.

Step-by-step procedure

Step 1: Inspect the vial

Hold the vial up to a light source. The lyophilized powder should look like:

• A small white or off-white "cake" or "puck" at the bottom of the vial
• Sometimes the cake is partially collapsed during shipping — this is normal as long as the color is white and there are no visible particles or discoloration
• The aluminum crimp seal should be intact and the rubber stopper should not show signs of compromise

If anything looks off, don't use it. Contact us with photos and we'll arrange a replacement.

Step 2: Wipe the stoppers

Use a 70% isopropyl alcohol swab to wipe the rubber stopper of both the BPC-157 vial and the bacteriostatic water vial. Let them air-dry for 10–15 seconds. Do not blow on them — the goal is to evaporate the alcohol, not to introduce contamination.

Step 3: Draw the bacteriostatic water

Using your 1mL insulin syringe, draw the desired volume of bacteriostatic water from its vial:

• For a 5mg BPC-157 vial → typically 2mL (results in 25 mcg/unit)
• For a 10mg BPC-157 vial → typically 2mL (results in 50 mcg/unit) or 4mL (results in 25 mcg/unit if you want the same concentration as the 5mg version)

Most researchers draw 1mL at a time, since a 1mL insulin syringe can't hold more than that. So a 2mL reconstitution means two transfers.

Step 4: Transfer the water into the BPC-157 vial — the critical step

This is the step where mistakes happen. Do not inject the water directly onto the lyophilized cake. Instead:

1. Insert the needle into the BPC-157 vial at an angle so the bevel is pointed at the inside wall of the vial
2. Slowly press the plunger so the water runs down the inside wall of the vial, not directly onto the powder
3. Take 5–10 seconds to inject the full volume

Why does this matter? Lyophilized peptide powder has a delicate molecular structure. A jet of water hitting it directly can shear the peptide bonds and degrade purity. The water-down-the-wall technique lets the powder rehydrate gently as the water level rises.

Step 5: Swirl, don't shake

Once all the water is in, gently swirl the vial in a circular motion for 15–20 seconds. The cake should dissolve smoothly. If it doesn't fully dissolve immediately, set the vial down and wait — most BPC-157 dissolves within 30 seconds. Do not shake or vortex. Both will introduce micro-foaming and shear forces that can degrade the peptide.

A properly reconstituted BPC-157 solution should be:

• Crystal clear
• Colorless (no yellow tint, no cloudiness)
• Free of visible particulate

If the solution is cloudy or has particulates, do not use it. Contact us with photos.

Step 6: Label and store

Write the reconstitution date on the vial label with a fine-tip permanent marker. Store the reconstituted vial in a refrigerator at 2–8°C and use within 21 days for BPC-157 (the bacteriostatic preservative loses effectiveness over longer periods).

For lyophilized vials you haven't reconstituted yet, store at -20°C — they'll remain stable for 24+ months under those conditions.

Two worked examples

Example A: 5mg BPC-157, 2mL bac water, 250 mcg dose

Quantity	Value
Peptide in vial	5 mg
Bac water added	2 mL
Concentration	2,500 mcg/mL
Per syringe unit	25 mcg
Units to draw for 250 mcg	10 units
Total doses available	20

Example B: 10mg BPC-157, 2mL bac water, 500 mcg dose

Quantity	Value
Peptide in vial	10 mg
Bac water added	2 mL
Concentration	5,000 mcg/mL
Per syringe unit	50 mcg
Units to draw for 500 mcg	10 units
Total doses available	20

Notice that in both examples you draw 10 units — the difference is that the 10mg vial gives you more total mcg per draw because the concentration is doubled.

Common mistakes (and how to avoid them)

1. Injecting water directly onto the cake. Always direct water down the inside wall of the vial.

2. Shaking instead of swirling. Foam = degraded peptide. Be patient.

3. Wrong syringe units. All insulin syringes (0.3mL, 0.5mL, 1mL) use the same 100 units/mL scale, but they hold different total volumes (30, 50, and 100 units respectively). If you're drawing 60 units for one dose, you can't fit it on a 0.5mL syringe — use a 1mL.

4. Forgetting the date. "I think this is from last week" is not good enough. Label it.

5. Using non-bacteriostatic water for multi-use vials. Plain sterile water has no preservative. After 24 hours, you're rolling the dice on bacterial contamination.

6. Skipping the alcohol swab. This is a 5-second step that prevents most contamination problems.

When in doubt, use the calculator

The most reliable way to avoid math errors is to use the reconstitution calculator on this site. Enter your vial size, the bacteriostatic water volume, and your desired dose — it returns the exact number of units to draw, the equivalent volume in mL, and a visual syringe showing where the plunger should sit.

If you have questions about a specific peptide or want to verify a reconstitution before you commit, message us on WhatsApp. Our team is happy to walk through it with you.

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This guide is part of our reconstitution series. Browse our BPC-157 listings or open the calculator to plan your specific dosing.