How to Reconstitute Ipamorelin: Laboratory Preparation Guide for Research Use Ipamorelin (Aib-His-D-2-Nal-D-Phe-Lys-NH2, MW 711.85 g/mol, CAS 170851-70-4) is a synthetic pentapeptide GHSR-1a agonist supplied as a lyophilised white powder in a 10mL sterile glass vial containing 5mg of peptide. As one of the most selective growth hormone secretagogue receptor agonists available for in vitro research, ipamorelin is readily soluble in aqueous media and straightforward to reconstitute for GHSR-1a receptor pharmacology and GH axis cell model applications. Materials Required Ipamorelin 5mg lyophilised vial Bacteriostatic water (BAC water) — 10mL vial 1mL sterile syringe with needle Alcohol swabs (70% isopropyl) Nitrile gloves Permanent marker for labelling Refrigerator at 2–8°C for storage Pre-Reconstitution Preparation Before reconstituting, inspect the vial to confirm the lyophilised powder appears as a white fluffy cake or powder with an intact seal. Remove from cold storage and allow the vial to reach room temperature for 10 minutes. Ipamorelin's relatively small molecular weight (711.85 g/mol) means it dissolves very quickly — room temperature equilibration is a precautionary step to minimise condensation rather than a dissolution requirement. Step-by-Step Reconstitution Protocol Step 1 — Prepare workspace. Wipe the work surface with 70% isopropyl alcohol and allow to dry fully. Use nitrile gloves throughout the procedure. Step 2 — Swab both stoppers. Clean the rubber stoppers of both the ipamorelin vial and BAC water vial with separate fresh alcohol swabs. Allow each to air dry for 10 seconds before inserting needles. Step 3 — Draw 2mL of bacteriostatic water. Using a sterile syringe, draw 2mL from the BAC water vial. The benzyl alcohol preservative in BAC water is essential for safe multi-use vial reconstitution and extends refrigerated solution stability to 28 days. Step 4 — Inject slowly along the vial wall. Insert the needle into the ipamorelin vial and angle the tip against the inner glass wall. Slowly inject the BAC water in a thin stream down the glass over 10–15 seconds, avoiding direct contact with the powder cake. Step 5 — Dissolve gently. Ipamorelin dissolves extremely rapidly due to its small size and high aqueous solubility. Gently swirl for 15–20 seconds — the solution should be fully clear and colourless almost immediately. Do not shake or vortex. If any powder adheres to the vial walls, tilt and swirl gently to bring it into solution. Step 6 — Inspect for clarity. Confirm the solution is completely clear with no visible particles or cloudiness before use or storage. Step 7 — Label the vial. Record reconstitution date, concentration (2.5mg/mL), and researcher initials on the vial. Resulting Concentration Adding 2mL BAC water to a 5mg ipamorelin vial yields a stock concentration of 2.5mg/mL (2500mcg/mL). For GHSR-1a receptor binding assays and cAMP accumulation studies in GH3 pituitary cell model preparations, working concentrations of 0.1nM to 1µM are prepared by serial dilution into assay buffer or serum-free media immediately prior to assay. 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 ipamorelin at −20°C prior to reconstitution, protected from light and moisture. Once reconstituted with BAC water, store at 2–8°C in the refrigerator. Reconstituted ipamorelin is stable for up to 28 days under refrigeration. Do not freeze reconstituted solution. Ipamorelin's pentapeptide structure is stable at physiological pH and in standard aqueous buffers. For working stock aliquots intended for long-term storage, dispense into sterile microcentrifuge tubes and store at −80°C, using each aliquot once to avoid freeze-thaw degradation. Research Application Notes Ipamorelin is freely soluble in BAC water, PBS, and standard aqueous buffers without any co-solvent requirement. Its exceptional GHSR-1a selectivity — confirmed absence of activity at ACTH-releasing, prolactin, and cortisol pathway receptors — makes it the preferred reference GHSR-1a agonist for in vitro GH axis research. When designing concentration-response studies in GH3 or pituitary somatotroph cell models, prepare working dilutions in serum-free DMEM immediately before assay. For long-duration cell model incubations, include DPP-IV inhibitor controls to confirm peptide stability in serum-containing conditions, as the N-terminal Aib residue provides some but not complete DPP-IV resistance. Ipamorelin 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.