Peptide products are typically delivered as lyophilized (freeze-dried) powder—appearing as a small white, fluffy powder or cake. Before use, they must be dissolved into a liquid, a process called reconstitution.
Reconstitution may sound simple—just add water, shake, and it's done? In fact, reconstitution is one of the most critical steps affecting the effectiveness of peptide products. Improper handling can lead to peptide degradation, reduced activity, or even complete loss of function.
I. Preparation Before Reconstitution
Before you begin, make sure you have the following items ready:
One vial of the peptide lyophilized powder to be reconstituted
One vial of sterile bacteriostatic water (BAC Water)
One sterile insulin syringe (1 mL, U-100)
Alcohol wipes
A clean work surface
Why use bacteriostatic water instead of regular water?
Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits bacterial growth during repeated withdrawals. Most research-grade peptide vials are multi-dose packages that require multiple punctures of the rubber stopper to withdraw the solution. Using bacteriostatic water effectively extends the storage time after reconstitution. If regular sterile water or normal saline is used, the solution must be used within 24–48 hours and carries a risk of contamination.
Cleanliness is the first critical step:
Wipe the rubber stoppers of both the peptide vial and the bacteriostatic water vial with an alcohol wipe for 10 seconds back and forth, then let them air-dry naturally. Although this action is simple, it is often overlooked and directly affects the cleanliness of the solution.
II. Reconstitution Procedure
Step 1: Draw bacteriostatic water
Using the syringe, draw the required amount of bacteriostatic water. The exact amount to draw depends on the concentration you wish to achieve (detailed below). Beginners are advised to draw 2–3 mL.
Step 2: Inject bacteriostatic water
Insert the needle into the rubber stopper of the peptide vial and slowly inject the bacteriostatic water into the vial. Key technique: Let the water flow down along the vial wall, rather than directly onto the lyophilized powder. This helps minimize bubble formation.
Step 3: Dissolve
After withdrawing the needle, gently rotate the vial (as if gently swirling a glass of wine) until the lyophilized powder is completely dissolved and the solution becomes clear and transparent. The entire dissolution process typically takes only one to two minutes.
Step 4: Inspect the solution
After dissolution, observe whether the solution is clear and transparent, free of particles, turbidity, or noticeable discoloration (some peptides such as GHK-CU may appear pale blue, which is normal). If any abnormality is observed, do not use the product and contact the supplier.
Step 5: Refrigerate immediately
After reconstitution is complete, place the peptide vial in the refrigerator (2–8°C). Do not leave it at room temperature; place it in the refrigerator as soon as possible.
⚠️ The most important rule: NEVER shake vigorously. Peptides are chains of amino acids. The physical shear force generated by vigorous shaking can damage their structure, leading to reduced activity. Gently rotate only—never shake vigorously up and down.