How much bacteriostatic water do I add to BPC-157?

For a 5mg vial, adding 2mL of bacteriostatic water gives you 250mcg per 0.1mL (10 units on an insulin syringe). This is the most common dilution for standard dosing.

Can I use sterile water instead of bacteriostatic water?

You can, but bacteriostatic water contains 0.9% benzyl alcohol which prevents bacterial growth. With sterile water, you must use the entire vial within 24 hours. Bacteriostatic water extends shelf life to 28 days refrigerated.

How do I know if my reconstituted BPC-157 has gone bad?

Look for cloudiness, floating particles, color changes, or an unusual smell. Properly reconstituted BPC-157 should be completely clear and colorless. If anything looks off, discard the vial.

What size syringe should I use for BPC-157 injections?

Use a 1mL (100 unit) insulin syringe with a 29-31 gauge needle. The fine gauge minimizes discomfort for subcutaneous injections and the 1mL volume matches standard reconstitution math.

BPC-157 Reconstitution: 5mg + 2mL Chart (2026)

BPC-157 Reconstitution: 5mg + 2mL Chart

How to Reconstitute BPC-157

You ordered your first vial of BPC-157 and now you're staring at a tiny bottle of white powder wondering what to do next. Don't worry — reconstitution sounds technical but it's straightforward once you understand the basics.

This guide walks you through mixing, measuring doses, and storing your peptide so nothing goes to waste.

What You Need

Before you start, gather everything:

BPC-157 lyophilized vial (typically 5mg or 10mg)
Bacteriostatic water (BAC water) — not sterile water, not saline
Insulin syringes — 1mL (100 unit), 29-31 gauge
Alcohol swabs — for cleaning vial tops
A clean, flat workspace

Why bacteriostatic water? It contains 0.9% benzyl alcohol that prevents bacteria from growing in your solution. Regular sterile water has no preservative, so the vial must be used within 24 hours. BAC water gives you up to 28 days refrigerated.

Step-by-Step Reconstitution

Step 1: Clean Everything

Wipe the tops of both vials (BPC-157 and BAC water) with alcohol swabs. Let them air dry for 10 seconds. This prevents contamination — skip it at your own risk.

Step 2: Draw Your Bacteriostatic Water

Using a fresh insulin syringe, draw your desired amount of BAC water. The amount you add determines your concentration (see the dilution charts below).

For most people, 2mL into a 5mg vial is the sweet spot. It gives clean, round numbers for standard doses.

Step 3: Add Water to the Peptide Vial

Insert the needle into the BPC-157 vial at an angle, aiming at the glass wall — not directly at the powder. Let the water trickle down the side of the vial gently.

Do not squirt water directly onto the powder. Peptides are fragile. Aggressive mixing can damage the molecular structure and reduce potency.

Step 4: Let It Dissolve

Gently swirl the vial with a slow rotating motion. Do not shake it. The powder should dissolve within 1-2 minutes into a perfectly clear, colorless solution.

If particles remain after 5 minutes of gentle swirling, the peptide may be degraded. A properly manufactured BPC-157 dissolves easily.

Step 5: Store Correctly

Refrigerate immediately at 36-46°F (2-8°C). The reconstituted solution is stable for up to 28 days with bacteriostatic water.

Dilution Charts

Why 2mL? It gives you clean, round numbers for standard doses — easy to measure, hard to mess up.

The Math (So You Can Do It Yourself)

Here's the formula for any vial size and any amount of water:

Concentration = Peptide Amount (mcg) ÷ Water Added (mL)

Then to find your injection volume:

Units to inject = Desired Dose (mcg) ÷ Concentration (mcg/mL) × 100

Example: 5,000mcg vial + 2mL water = 2,500mcg/mL. For a 250mcg dose: 250 ÷ 2,500 × 100 = 10 units.

Don't want to do math? Use our Reconstitution Calculator — plug in your vial size, water amount, and desired dose, and it does the rest.

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Common Mistakes

Shaking the Vial

Peptides are proteins. Shaking creates foam, which means air bubbles trapped against peptide molecules. This can denature (destroy) the peptide at the air-liquid interface. Always swirl gently.

Using Too Little Water

Adding 0.5mL to a 5mg vial gives you 10,000mcg/mL. That means a 250mcg dose is only 2.5 units — nearly impossible to measure accurately on an insulin syringe. The tiny tick marks become your enemy. Use at least 1mL, ideally 2mL.

Leaving It at Room Temperature

Reconstituted BPC-157 degrades rapidly above refrigerator temperature. Every hour at room temperature reduces potency. Pull the vial out, draw your dose, put it back. Don't leave it on the counter while you prep.

Reusing Needles

Each puncture through the rubber stopper dulls the needle and increases contamination risk. Fresh syringe every time — they cost pennies.

Freezing Reconstituted Peptide

Freezing a liquid peptide solution creates ice crystals that can shear the peptide bonds apart. Only freeze lyophilized (powder) peptides. Once reconstituted, refrigerate — never freeze.

How Many Doses Per Vial?

This depends on your dose and how much water you added:

5mg vial at 250mcg/dose = 20 doses 5mg vial at 500mcg/dose = 10 doses 10mg vial at 250mcg/dose = 40 doses 10mg vial at 500mcg/dose = 20 doses

At a standard protocol of 250mcg twice daily, a 5mg vial lasts 10 days. A 10mg vial lasts 20 days.

Storage Quick Reference

State	Temperature	Shelf Life
Lyophilized (powder)	Room temp	6-12 months
Lyophilized (powder)	Refrigerated	2+ years
Lyophilized (powder)	Frozen (-20°C)	3+ years
Reconstituted (BAC water)	Refrigerated	Up to 28 days
Reconstituted (sterile water)	Refrigerated	Use within 24 hours

Pro tip: If you buy multiple vials, keep unopened ones in the freezer and only reconstitute what you'll use within 3-4 weeks.

BPC-157 Dosing Guide — protocols, injection sites, and cycling
Where to Buy BPC-157 — pricing, vial sizes, and COA verification
BPC-157 Bloodwork Guide — what labs to track and optimal ranges
BPC-157 Benefits — what the research shows
Wolverine Stack: BPC-157 + TB-500 — the classic healing combo
TB-500 Dosing Guide — often stacked with BPC-157
GHK-Cu Dosing Guide — another regenerative peptide for tissue repair
Calculate Your BPC-157 Cycle Cost — estimate vials needed and total cost for your protocol

References

Chang, C.H., et al. (2014). Pentadecapeptide BPC 157 enhances the growth hormone receptor expression in tendon fibroblasts. Molecules, 19(11), 19066-19077. PMC6271067
Seiwerth, S., et al. (2018). BPC 157's effect on healing. Journal of Physiology-Paris, 112(1), 1-10.
USP General Chapter 797: Pharmaceutical Compounding — Sterile Preparations. Storage and beyond-use dating guidelines for reconstituted peptides.

This guide is for educational and informational purposes only. It is not medical advice. BPC-157 is sold as a research compound and is not FDA-approved for human use. Reconstituting and self-administering peptides carries inherent risks including infection, contamination, and dosing errors. Always use proper sterile technique. Consult a qualified healthcare provider before starting any peptide protocol. The Peptide Catalog is not responsible for any adverse effects resulting from the use or misuse of information presented here.