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How to Reconstitute a Peptide — Step-by-Step Protocol
Step-by-Step Protocol
Step 1: Gather Your Supplies
You will need: lyophilized peptide vial, bacteriostatic water vial (10ml or 30ml), insulin syringe (U-100, 1ml), alcohol swabs, clean work surface, pen and label. Wash hands thoroughly before beginning.
Step 2: Disinfect Both Vial Stoppers
Wipe the rubber stopper of both the peptide vial and the bacteriostatic water vial with a fresh 70% isopropyl alcohol swab. Allow each stopper to air dry for 30 seconds before puncturing.
Step 3: Calculate Your Volume
Determine how much bacteriostatic water to add based on your desired working concentration. Formula: mL of BAC water = Total mcg of peptide ÷ Desired mcg/mL concentration. Example: 5mg peptide ÷ 2,500mcg/mL = 2ml of BAC water.
Step 4: Draw the Bacteriostatic Water
Insert the syringe needle into the bacteriostatic water vial stopper. Invert the vial and draw the calculated volume of BAC water into the syringe. Remove the syringe and check for air bubbles — gently tap to remove any.
Step 5: Inject Water Into Peptide Vial — Slowly
THIS IS THE MOST IMPORTANT STEP. Point the needle tip at the inner glass wall of the peptide vial (not at the powder cake). Slowly inject the bacteriostatic water down the side of the glass. This gentle introduction prevents foaming and protein denaturation.
Step 6: Dissolve Gently
Do NOT shake the vial. Gently swirl in a circular motion, or roll the vial slowly between your palms. Continue until all powder is completely dissolved and the solution is clear and colorless. Some peptides take 30–60 seconds; others may take longer.
Step 7: Label and Store Immediately
Label the vial with: peptide name, date of reconstitution, concentration (mcg/mL), and expiration date (reconstitution date + 28 days). Store immediately in your refrigerator at 2–8°C. Never freeze reconstituted peptides.
Frequently Asked Questions
What do I need to reconstitute a peptide?
You need a lyophilized peptide vial, bacteriostatic water, a sterile syringe (typically insulin syringe), alcohol swabs, and a clean work surface. Ideally, work under a laminar flow hood or sterile environment.
How much bacteriostatic water do I add to reconstitute a peptide?
The amount depends on your desired concentration. Use the formula: Volume of BAC water (mL) = Total peptide amount (mcg) ÷ Desired concentration (mcg/mL). For a 5mg (5,000mcg) vial at 2,500mcg/mL, add 2ml of bacteriostatic water.
Should I shake the peptide vial after adding water?
No. Shaking can cause foaming and peptide denaturation. Instead, inject the water slowly down the vial wall and gently swirl or roll between your palms until dissolved.
Related: Peptide Reconstitution Guide | Order Bacteriostatic Water | Certificate of Analysis
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