How to Reconstitute BPC-157: Step-by-Step Laboratory Protocol BPC-157 (Body Protection Compound-157, sequence GEPPPGKPADDAGLV, MW 1419.5 g/mol, CAS 137525-51-0) is a synthetic pentadecapeptide supplied as a lyophilised white powder in a 10mL sterile glass vial containing 5mg of peptide. Proper reconstitution using aseptic technique is essential for maintaining compound integrity, achieving accurate working concentrations, and ensuring reproducible results in VEGFR2 receptor pharmacology and gastrointestinal cell model research applications. Materials Required BPC-157 5mg lyophilised vial Bacteriostatic water (BAC water) — 10mL vial 1mL or 2mL sterile syringe with needle 18–21 gauge needle for drawing Alcohol swabs (70% isopropyl) Nitrile gloves Permanent marker for labelling Refrigerator set to 2–8°C for storage Pre-Reconstitution Preparation Inspect the BPC-157 vial to confirm the lyophilised powder is white, intact and the seal is unbroken. Remove from cold storage and allow to equilibrate to room temperature for 10–15 minutes to prevent condensation forming when cold glass contacts warm air. Step-by-Step Reconstitution Protocol Step 1 — Prepare your workspace. Wipe the work surface thoroughly with 70% isopropyl alcohol and allow to air dry completely. Put on nitrile gloves. A clean, draft-free workspace minimises contamination risk during the reconstitution procedure. Step 2 — Swab both vial stoppers. Using a fresh alcohol swab, clean the rubber stopper of the BPC-157 vial and a separate swab for the BAC water vial. Allow both to air dry for 10–15 seconds before proceeding. Step 3 — Draw the bacteriostatic water. Using a sterile syringe, pierce the BAC water vial stopper and draw 2mL of bacteriostatic water. Bacteriostatic water is preferred over sterile water for peptide reconstitution as it contains 0.9% benzyl alcohol, which inhibits microbial growth and extends the usable life of the reconstituted solution under refrigeration. Step 4 — Inject slowly down the inner vial wall. Insert the needle into the BPC-157 vial at a slight angle and position the needle tip so the stream of BAC water runs slowly down the inner glass wall of the vial rather than directly onto the powder cake. Inject over 15–20 seconds. Directing the solvent against the glass rather than the powder preserves the lyophilised structure and promotes even, gentle dissolution rather than mechanical disruption of the peptide. Step 5 — Dissolve by gentle swirling. Once the BAC water has been added, gently swirl the vial in slow circular motions for 20–30 seconds. BPC-157 is freely soluble in aqueous media and should dissolve readily at this concentration. The final solution should be clear and colourless. If any undissolved particles remain, continue gentle swirling — do not shake or vortex the vial, as mechanical agitation can cause peptide aggregation and potential degradation. Step 6 — Inspect the solution. Hold the vial up to light and inspect for clarity. A properly reconstituted BPC-157 solution is transparent and colourless with no visible particles or cloudiness. Discard the vial if the solution appears turbid or contains visible particulate matter. Step 7 — Label the vial. Using a permanent marker, record the reconstitution date, resulting concentration, and your initials on the vial label. This is essential for tracking the 28-day refrigerated stability window. Resulting Concentration Adding 2mL of BAC water to a 5mg BPC-157 vial yields a stock concentration of 2.5mg/mL (2500mcg/mL). This stock solution can be further diluted with sterile PBS, cell culture media, or assay buffer to achieve the working concentrations required for specific in vitro research protocols. For VEGFR2 phosphorylation assays and gastrointestinal epithelial cell model studies, working concentrations typically range from 1ng/mL to 10mcg/mL depending on the assay system and endpoint being measured. Concentration Reference Table BAC Water Volume AddedResulting Concentration 1mL5.0mg/mL (5000mcg/mL) 2mL2.5mg/mL (2500mcg/mL) 5mL1.0mg/mL (1000mcg/mL) Storage Conditions and Stability Store lyophilised BPC-157 at −20°C, protected from light and moisture. Once reconstituted with BAC water, store at 2–8°C. Reconstituted BPC-157 is stable for up to 28 days under refrigeration — protect from light by wrapping the vial in foil. Do not freeze reconstituted solution as freeze-thaw cycles can cause peptide aggregation. For long-term working aliquot storage, prepare single-use aliquots in sterile microcentrifuge tubes and store at −80°C. Research Application Notes BPC-157 is freely soluble in BAC water without co-solvents. The reconstituted stock can be diluted directly into serum-free media for receptor binding or signalling assays. BPC-157's proline-rich structure confers relative proteolytic stability in serum-containing media, supporting standard cell culture incubation durations without significant compound degradation. BPC-157 5mg vials are available from Pinnacle Peptides, verified at ≥99% purity by HPLC and mass spectrometry. All content is intended for in vitro laboratory research purposes only. Not for human or animal consumption. Not intended to diagnose, treat, cure, or prevent any condition.