Peptide Dosage & Reconstitution

Most peptides arrive as lyophilized (freeze-dried) powder. Reconstitution means adding a diluent (commonly bacteriostatic water) to dissolve the powder so it can be drawn into a syringe.

Bacteriostatic water (BaW) is sterile water containing 0.9% benzyl alcohol. The preservative inhibits bacterial growth in multi-dose vials, allowing repeated withdrawals for up to 28 days once opened (if stored correctly). It is not the same as sterile water for injection (SWFI). Always follow the instructions supplied with your product.

It depends on the concentration you want. Example: 5 mg peptide + 2 mL BaW → 2.5 mg/mL. Use the calculator above to target a per-mL strength that makes dosing simple.

Volume (mL) = Desired dose (mg) ÷ Vial strength (mg/mL). This calculator does the conversion for you using your weekly mg dose and schedule, and outputs mL per injection plus approximate U-100 units.

On a standard U-100 insulin syringe, 1 mL = 100 units. The tool multiplies the mL dose by 100 so you can see an approximate mark on a U-100 syringe (for example, 0.20 mL ≈ 20 units).

• Refrigerate (2–8 °C / 36–46 °F) unless your product instructions state otherwise.
• Label the vial with date and concentration (e.g., “5 mg in 2 mL = 2.5 mg/mL”).
• Minimize temperature cycling; keep out of light.

General practice: use within 28 days when mixed with BaW and refrigerated. Actual stability varies by peptide and manufacturer—follow your product’s guidance.

• Alcohol swab stoppers and skin; let dry.
• Use new sterile needles/syringes each time.
• Do not leave needles in the vial. Cap promptly; refrigerate.