Reconstitution Guide for Beginners

Reconstitution is the process of adding a solvent (usually bacteriostatic water) to a lyophilised (freeze-dried) peptide powder to create an injectable or usable solution. Peptides are sold as dry powder because it is the most stable form for storage and shipping.

The process is straightforward but requires attention to sterile technique and accurate measurement. Getting the concentration right matters: too little water and the dose becomes difficult to measure accurately, too much and you dilute the peptide unnecessarily.

Before you begin, gather the following supplies: bacteriostatic water (BAC water, contains 0.9% benzyl alcohol as a preservative), insulin syringes (typically 1 mL with 29 to 31 gauge needles), alcohol swabs for sterilising vial tops, and the lyophilised peptide vial.

Bacteriostatic water is preferred over sterile water because the benzyl alcohol preservative inhibits bacterial growth, allowing the reconstituted solution to be stored for 2 to 4 weeks. Sterile water contains no preservative and should be used within 24 to 48 hours of reconstitution.

All supplies are available from peptide vendors or through our store at /store.

Step 1: Wash your hands thoroughly or wear sterile gloves.

Step 2: Swab the top of both the peptide vial and the BAC water vial with an alcohol prep pad. Allow to air dry for 10 seconds.

Step 3: Draw up the desired amount of BAC water into an insulin syringe. A common starting volume is 1 mL (100 units on an insulin syringe) per vial, but this depends on the peptide amount and your preferred concentration.

Step 4: Insert the needle into the peptide vial at an angle, with the tip touching the inner glass wall. Do not inject the water directly onto the powder.

Step 5: Slowly push the plunger to release the BAC water down the side of the vial. Let it run gently onto the powder. Do not shake, squirt, or agitate.

Step 6: Withdraw the needle. Gently swirl the vial in a circular motion until the powder is fully dissolved. This may take 30 seconds to several minutes. Never shake the vial, as this can damage the peptide through shear forces.

Once reconstituted, you need to know how much solution to draw for your desired dose. The formula is simple:

Volume to draw (mL) = desired dose (mcg) divided by concentration (mcg per mL).

Concentration (mcg per mL) = total peptide in vial (mcg) divided by total water added (mL).

Example: You have a 5 mg (5,000 mcg) vial of BPC-157 reconstituted with 2 mL of BAC water. Concentration = 5,000 mcg / 2 mL = 2,500 mcg per mL. For a 250 mcg dose: 250 / 2,500 = 0.1 mL = 10 units on an insulin syringe.

Our free dosing calculator at /calculator handles this maths automatically. Enter the vial size, water volume, and desired dose to get the exact number of units to draw.

Shaking the vial: this creates air bubbles and can denature the peptide through mechanical stress. Always swirl gently.

Injecting water directly onto the powder: this can cause clumping and uneven dissolution. Let the water run down the vial wall.

Using too little water: this makes accurate dosing nearly impossible with a standard insulin syringe. Use at least 1 mL per vial unless working with very high-dose protocols.

Reusing syringes: insulin syringes are single-use. The needle dulls after one use and increases the risk of contamination. Never reuse a syringe.

Touching the needle: if the needle contacts anything other than the vial stopper and the injection site, discard it and use a new syringe.

Storing at room temperature: reconstituted peptides must be refrigerated at 2 to 8 degrees Celsius immediately after preparation.

Reconstituted peptides should be refrigerated at 2 to 8 degrees Celsius immediately. Most reconstituted peptides remain stable for 2 to 4 weeks when stored properly.

Keep the vial upright to prevent the solution from contacting the rubber stopper for extended periods. Store in a dark location or wrap the vial in aluminium foil to protect from light degradation.

Do not freeze reconstituted peptides unless you are aliquoting into single-use portions. Repeated freeze-thaw cycles damage peptide structure. See our storage guide at /guides/how-to-store-peptides for comprehensive storage advice.

Contamination is the biggest practical risk in peptide handling. Bacteria introduced during reconstitution can multiply in the solution, especially if stored for weeks. Bacteriostatic water reduces this risk but does not eliminate it.

Always work on a clean surface. Wash hands or wear gloves. Swab every vial top with alcohol before piercing. Use a new syringe and needle for every draw. Never touch the needle tip or the inside of the syringe barrel.

If you notice cloudiness, particles, discolouration, or an unusual smell in a reconstituted peptide, discard it immediately. These are signs of contamination or degradation.

This guide is for educational and informational purposes only. It is not intended as medical advice and should not be used as a substitute for professional medical guidance, diagnosis, or treatment. Always consult a qualified healthcare professional before starting any new supplement or peptide protocol.