How to Reconstitute Peptides

Reconstitution is the process of dissolving a lyophilized (freeze-dried) peptide powder into a liquid solution so it can be accurately measured and administered. Peptides are shipped as dry powder because they're far more stable in this form — reconstituted peptides degrade over time, especially at room temperature.

The liquid used is almost always bacteriostatic water (BAC water), which contains 0.9% benzyl alcohol as a preservative. This prevents bacterial growth in the vial after reconstitution, giving you a usable window of approximately 28 days when stored properly at 2–8°C.

Before you begin, gather the following supplies:

• Lyophilized peptide vial — Check the label for the total peptide content (e.g., 5 mg, 10 mg).
• Bacteriostatic water (BAC water) — A 30 mL vial is standard and will last through multiple reconstitutions.
• Insulin syringes — 1 mL (100 unit) syringes with 29–31 gauge needles for drawing and injecting BAC water.
• Alcohol swabs — For sterilizing vial stoppers before each puncture.
• A clean, flat workspace — Minimize dust and contamination risk.

Follow these steps carefully to reconstitute your peptide without damaging it:

1. Wash your hands thoroughly or wear nitrile gloves.
2. Swab the stoppers of both the peptide vial and the BAC water vial with alcohol pads. Allow them to air dry for 10 seconds.
3. Draw your BAC water. Insert the syringe into the BAC water vial, invert it, and draw the desired volume. For most peptides, 1–2 mL is standard (see reconstitution math below).
4. Inject BAC water into the peptide vial. Insert the needle at an angle and direct the stream against the glass wall of the vial — never squirt directly onto the powder. This prevents damage from the force of the liquid.
5. Let it dissolve. After adding the water, gently swirl the vial in a circular motion. Never shake vigorously — this can denature the peptide and create foam that makes accurate dosing impossible.
6. Inspect the solution. It should be clear and colorless. If particles remain, let the vial sit in the refrigerator for 15–30 minutes and swirl again.
7. Store immediately at 2–8°C (standard refrigerator temperature). Use within 28 days.

Understanding reconstitution math is essential for accurate dosing. Here's the formula:

Concentration = Total Peptide (mcg) ÷ Volume of BAC Water (mL)

Example 1: You have a 5 mg (5,000 mcg) vial of BPC-157 and add 2 mL of BAC water.

• Concentration = 5,000 mcg ÷ 2 mL = 2,500 mcg/mL
• Each 0.1 mL (10 units on an insulin syringe) = 250 mcg
• For a 250 mcg dose, draw to the 10-unit mark

Example 2: You have a 10 mg (10,000 mcg) vial of TB-500 and add 2 mL of BAC water.

• Concentration = 10,000 mcg ÷ 2 mL = 5,000 mcg/mL
• Each 0.1 mL (10 units) = 500 mcg
• For a 2.5 mg (2,500 mcg) dose, draw to the 50-unit mark

Pro tip: Using round numbers for your BAC water volume (1 mL or 2 mL) makes the math much simpler and reduces dosing errors.

These errors can destroy your peptide or lead to inaccurate dosing:

• Squirting water directly onto the powder. The force can damage peptide bonds. Always aim down the glass wall.
• Shaking the vial. Vigorous shaking denatures proteins. Gentle swirling only.
• Using sterile water instead of bacteriostatic water. Sterile water lacks preservatives, so bacteria can grow within hours. Only use sterile water if you plan to use the entire vial immediately.
• Leaving reconstituted peptides at room temperature. Peptides degrade rapidly above 8°C. Return vials to the refrigerator immediately after drawing your dose.
• Reusing syringes. Always use a fresh syringe for each draw to maintain sterility and dosing accuracy.

This guide is provided for educational and informational purposes only. Peptides discussed in this article are sold as research chemicals and are not approved by the FDA for human use. Always consult a qualified healthcare provider before beginning any research protocol. DailyVial does not encourage or condone the use of research peptides for self-administration.