How to use this calculator

Step 1 — Select Your Syringe Choose the insulin syringe size you’re working with: 0.3 mL (30 units), 0.5 mL (50 units), or 1.0 mL (100 units). This tells the calculator how to express your draw volume in syringe units so you can measure accurately.

Step 2 — Enter Your Vial Size and BAC Water Volume Select the total peptide quantity in your vial (in mg) and how much bacteriostatic water you’re adding. Most researchers use 1–2 mL of BAC water per vial. The ratio of these two numbers determines your concentration.

Step 3 — Set Your Per-Injection Dose Choose your dose in mg. The calculator instantly returns your draw volume in mL, the exact units to pull on your syringe, your concentration per mL, total doses in the vial, and your days supply.

Frequently Asked Questions

Q: What is bacteriostatic water and why do I need it? Bacteriostatic water (BAC water) is sterile water preserved with 0.9% benzyl alcohol, which prevents bacterial growth. It’s the standard diluent for peptide reconstitution because it keeps your solution stable in the refrigerator for weeks. Do not use plain sterile water — it has no preservative and the solution will degrade much faster.

Q: What syringe size should I use for peptide injections? Most researchers use U-100 insulin syringes in 0.3 mL, 0.5 mL, or 1.0 mL sizes. Smaller syringes (0.3 mL / 30-unit) are ideal for low-volume, precise draws. A 1.0 mL syringe works fine for larger draw volumes. Use the calculator above to determine which syringe size aligns best with your dose.

Q: How much BAC water should I add to my vial? The most common approach is 1–2 mL per vial. Adding less BAC water increases your concentration (smaller draw volume per dose). Adding more decreases concentration (larger draw volume). Neither is wrong — it’s a matter of preference and your syringe size. The calculator handles any BAC water volume.

Q: How long does a reconstituted peptide vial last? Most reconstituted peptides remain stable for 4–6 weeks when refrigerated at 2–8°C. Stability varies by peptide — some are more fragile than others. Always check your specific research protocol. Never freeze a reconstituted vial; freeze-thaw cycles degrade the peptide.

Q: What does “concentration” mean in the results? Concentration is expressed as mg per mL (mg/mL). It tells you how much peptide is dissolved in each milliliter of your solution. If you add 1 mL of BAC water to a 5 mg vial, your concentration is 5 mg/mL. This number is the basis for all dosing math — the calculator derives your draw volume directly from it.

Q: Can I use this calculator for any peptide? Yes. The math is the same regardless of the peptide — BPC-157, TB-500, Semaglutide, CJC-1295, Ipamorelin, or anything else. The calculator doesn’t care what’s in the vial, only the quantities: vial size, BAC water volume, and your target dose.

SHOP

Need Supplies

Everything you need to reconstitute and dose accurately — in stock and ready to ship.