How to Reconstitute BPC-157: Step-by-Step Research Guide
Step-by-step guide to reconstituting lyophilized BPC-157 powder for preclinical research: bacteriostatic water volumes, concentration tables, storage conditions, and draw-volume calculations — with the reconstitution calculator.
Research reference only. The information in this article is a summary of peer-reviewed scientific literature. It does not constitute medical advice and is not intended to guide human use. See our full disclaimer.
This guide covers the standard laboratory procedure for reconstituting lyophilized BPC-157 powder for preclinical research use. All information is for research purposes only. BPC-157 is not FDA-approved for any indication and is an investigational compound.
What Is Reconstitution?
Lyophilized (freeze-dried) BPC-157 is supplied as a white powder that must be dissolved in a sterile liquid before research use. The process of dissolving lyophilized peptide powder into solution is called reconstitution. The resulting solution has a defined concentration — typically expressed in micrograms per milliliter (mcg/mL) — which determines the volume needed for each experimental dose.
Use the Peptide Reconstitution Calculator to calculate exact volumes for your target concentration. The calculator accepts vial amount, reconstitution volume, and desired dose to output the precise draw volume.
BPC-157 Identity and Physical Properties
BPC-157 (Body Protection Compound-157) is a synthetic pentadecapeptide with the amino acid sequence Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val.
| Property | Value |
|---|---|
| Molecular weight | 1,419.5 Da |
| Sequence length | 15 amino acids |
| CAS number | 137525-51-0 (free base) |
| CAS number | 914295-16-2 (acetate salt) |
| Solubility | Soluble in aqueous solution; acetic acid co-solvent may assist at higher concentrations |
| Lyophilized appearance | White to off-white powder |
BPC-157 is generally considered water-soluble at research concentrations (250–2,000 mcg/mL). In some preparations, a small amount of 0.1% glacial acetic acid (1–2 drops per mL) is used to facilitate initial dissolution before diluting to target volume with bacteriostatic water. This varies by supplier and preparation.
Materials Required
The following materials are standard for peptide reconstitution in a research setting:
- Lyophilized BPC-157 vial (sealed under inert gas or vacuum)
- Bacteriostatic water for injection (BAC water, 0.9% benzyl alcohol preserved)
- Sterile insulin syringes (28–31 gauge, 0.5 mL or 1 mL)
- Sterile reconstitution vials (if transferring from single-use vials)
- Alcohol prep swabs (70% isopropyl alcohol or 70% ethanol)
- Clean work surface or biosafety cabinet
- Refrigerator (2–8°C for storage)
Bacteriostatic water versus sterile water: Bacteriostatic water (0.9% benzyl alcohol) inhibits microbial growth and extends the usable life of reconstituted peptide solutions to approximately 28–42 days under refrigeration. Sterile water for injection (no preservative) should be used only if the entire volume will be used immediately; without a bacteriostatic agent, microbial contamination risk rises rapidly after the first draw from a multi-dose vial. For multi-dose research vials, bacteriostatic water is standard practice.
For background on bacteriostatic water chemistry and preservative mechanisms, see: What Is Bacteriostatic Water and Why It Matters for Reconstitution.
Reconstitution Procedure
Before beginning: Confirm that all materials are within their expiry dates. Wipe the vial septum and syringe port with an alcohol swab and allow to air-dry for 10–15 seconds before each penetration.
Step 1 — Calculate the target reconstitution volume
Determine the concentration you need for your research protocol. Common research concentrations for BPC-157 are 250 mcg/mL, 500 mcg/mL, and 1,000 mcg/mL.
Example: A 5 mg (5,000 mcg) vial reconstituted with 5 mL bacteriostatic water = 1,000 mcg/mL
| Vial amount | BAC water volume | Resulting concentration |
|---|---|---|
| 5 mg (5,000 mcg) | 2 mL | 2,500 mcg/mL |
| 5 mg (5,000 mcg) | 5 mL | 1,000 mcg/mL |
| 5 mg (5,000 mcg) | 10 mL | 500 mcg/mL |
| 5 mg (5,000 mcg) | 20 mL | 250 mcg/mL |
For custom volumes and dose calculations, use the Peptide Reconstitution Calculator.
Step 2 — Prepare the vial
Remove the plastic cap from the BPC-157 vial (if present) to expose the rubber septum. Wipe the rubber septum with an alcohol swab. Allow to air-dry completely — do not blow on or fan the surface.
Step 3 — Draw up bacteriostatic water
Using an insulin syringe, draw up the calculated volume of bacteriostatic water. Standard insulin syringes are graduated in units; use the unit-to-mL conversion printed on the syringe barrel (U-100 insulin syringes: 100 units = 1 mL).
Step 4 — Inject bacteriostatic water into the peptide vial
Insert the syringe needle through the rubber septum of the BPC-157 vial at an angle. Direct the stream of bacteriostatic water to run down the inside wall of the vial rather than directly onto the lyophilized powder cake. This minimizes mechanical disruption to the peptide structure during initial hydration.
Do not forcefully inject or agitate. Add the bacteriostatic water slowly.
Step 5 — Allow to dissolve; gently swirl
Once the water is added, cap the syringe and set the vial upright. BPC-157 typically dissolves within 30–120 seconds at room temperature. Gently swirl (do not shake or vortex) until the solution appears clear and all powder is dissolved.
If powder does not dissolve fully: For preparations that resist dissolution, briefly roll the vial between your palms to warm it slightly (do not exceed 37°C), or allow additional time. If a small amount of acetic acid co-solvent was recommended by your supplier protocol, add 1–2 drops of 0.1% glacial acetic acid before adding bacteriostatic water, then proceed.
Step 6 — Inspect the solution
Hold the vial against a light source and inspect for undissolved particulates, cloudiness, or discoloration. BPC-157 solution should be clear and colorless to faintly yellow. If significant turbidity or visible particles remain after swirling, do not use; potential contamination or reconstitution failure.
Step 7 — Label and store
Label the vial with:
- Compound name (BPC-157)
- Concentration (mcg/mL)
- Reconstitution date
- Expiry date (typically 28–42 days from reconstitution under refrigeration)
Store at 2–8°C (standard refrigerator temperature) protected from light. Do not freeze reconstituted BPC-157 solution; freeze-thaw cycles degrade peptide integrity.
Calculating Draw Volume for Research Use
Once reconstituted, the volume to draw for a given experimental dose is calculated using:
Draw volume (mL) = Dose (mcg) ÷ Concentration (mcg/mL)
Example with a 500 mcg/mL solution:
| Research dose | Draw volume |
|---|---|
| 250 mcg | 0.50 mL (50 units on U-100 syringe) |
| 500 mcg | 1.00 mL (100 units on U-100 syringe) |
| 100 mcg | 0.20 mL (20 units on U-100 syringe) |
Use the Peptide Reconstitution Calculator to avoid manual calculation errors — input your vial amount, reconstitution volume, and desired dose, and the calculator outputs the exact draw volume.
Storage Summary
| Condition | Duration |
|---|---|
| Lyophilized (sealed vial, −20°C) | 24–36 months (per supplier specifications) |
| Lyophilized (sealed vial, 2–8°C) | 6–12 months |
| Reconstituted with BAC water (2–8°C) | 28–42 days |
| Reconstituted with sterile water (2–8°C) | Use within 24 hours (no bacteriostatic agent) |
| Reconstituted, frozen | Not recommended (freeze-thaw degradation) |
Storage durations are guidelines based on standard peptide stability literature. Actual stability varies with preparation quality, pH, and storage conditions. HPLC purity testing at the time of use is the definitive method for confirming peptide integrity.
Purity and Verification
Research-grade BPC-157 should be accompanied by a Certificate of Analysis (CoA) from the supplying laboratory confirming:
- HPLC purity ≥98% (chromatographic purity by area percentage)
- Mass spectrometry confirmation (molecular weight matched to 1,419.5 Da)
- Microbial testing (endotoxin, sterility if applicable)
For a detailed explanation of how to interpret peptide purity data, see: Understanding Peptide Purity: HPLC and Mass Spec Analysis.
Related Resources
- Peptide Reconstitution Calculator — Volume and concentration calculator for any peptide vial
- BPC-157 Compound Library Entry — Molecular data, sequence, regulatory status, and preclinical literature summary
- BPC-157 Phase 2 Trial NCT07437547 — Overview of the first registered human RCT of BPC-157
- BPC-157 FDA PCAC Status — 503A compounding classification and July 2026 PCAC review
- The Science Behind Peptide Reconstitution — Chemistry of lyophilization, solubility, and bacteriostatic water
Frequently Asked Questions
What is the best solvent for reconstituting BPC-157? Bacteriostatic water (0.9% benzyl alcohol) is the standard solvent for BPC-157 reconstitution in a research context. It is compatible with BPC-157's aqueous solubility profile and provides preservative activity that extends the usable shelf life of reconstituted solutions to approximately 28–42 days under refrigeration. If the lyophilized preparation does not dissolve readily, a small amount of 0.1% glacial acetic acid may be used as a co-solvent before diluting to volume with bacteriostatic water — consult your supplier's Certificate of Analysis for preparation-specific guidance.
How long does reconstituted BPC-157 last in the refrigerator? Reconstituted BPC-157 in bacteriostatic water is typically stable for 28–42 days at 2–8°C when stored in a sealed vial, protected from light, and handled with sterile technique. These estimates are based on general peptide stability data; actual stability depends on starting purity, preparation pH, and storage conditions. For time-sensitive research, HPLC re-testing of reconstituted peptide is the definitive approach to confirming integrity.
Should BPC-157 be shaken or stirred during reconstitution? No. Shaking or vortexing can introduce air bubbles and may cause mechanical degradation of the peptide structure. Gentle swirling or rolling is the preferred method. Direct the bacteriostatic water stream along the inside wall of the vial during injection to further minimize agitation of the lyophilized powder cake.
What concentration should I use for BPC-157 research? Target concentration depends on the experimental design, dose range, and injection volume constraints of the model used. Published rodent preclinical studies have used a wide range of BPC-157 concentrations; consult the specific methods sections of primary literature relevant to your model. The Peptide Reconstitution Calculator accepts any vial amount and target dose to output the appropriate reconstitution volume.
Can BPC-157 solution be frozen after reconstitution? Repeated freeze-thaw cycles are generally considered detrimental to peptide stability and are not recommended for reconstituted BPC-157 solutions. If long-term storage beyond 28–42 days is required, lyophilized powder stored at −20°C is preferable. Single-use aliquots prepared at −80°C using a cryoprotectant are used in some research settings to extend storage, but this is outside standard practice for short-term research use.