PEPTIDE DOSING
CALCULATOR
Calculate exact reconstitution volumes, draw amounts, and U-100 insulin syringe markings for any research peptide.
Enter your vial size, bacteriostatic water volume, and desired dose — get precise numbers instantly. Supports both mcg and mg units for 100+ peptides.
RECONSTITUTION CALCULATOR
Enter your vial, BAC water, and dose below.
Results
Educational reference only — not medical advice. Disclaimer
HOW TO USE THIS CALCULATOR
Four inputs. Instant results.
Enter Vial Size
Input the total peptide amount in your vial (e.g., 5 mg or 5,000 mcg). This is printed on the vial label. Toggle between mg and mcg depending on how your vial is labelled.
Enter BAC Water Volume
Enter how much bacteriostatic water you plan to add — or already added — to the vial. Most protocols use 1–3 mL. This determines the concentration of your reconstituted solution.
Enter Your Desired Dose
Enter the per-injection dose you intend to use. If you selected a peptide from the dropdown, this field auto-fills with the typical research protocol dose.
Read Your Results
The calculator instantly shows your solution concentration (mcg/mL), the volume to draw (mL), and the corresponding units on a standard U-100 insulin syringe.
HOW PEPTIDE RECONSTITUTION WORKS
Research peptides are sold as lyophilized (freeze-dried) powder. Before injection, the powder must be dissolved in bacteriostatic water to create an injectable solution. The concentration of that solution determines how much you draw for each dose.
The Three Formulas
Worked Example — BPC-157
- Vial size: 5 mg = 5,000 mcg
- BAC water added: 2 mL
- Concentration: 5,000 ÷ 2 = 2,500 mcg/mL
- Desired dose: 250 mcg
- Draw volume: 250 ÷ 2,500 = 0.10 mL
- Syringe marking: 0.10 × 100 = 10 units on a U-100 syringe
COMMON PEPTIDE REFERENCE
Pre-calculated examples using standard vial sizes and typical research doses.
| Peptide | Vial | BAC Water | Dose | Concentration | Draw Volume | Syringe Units |
|---|---|---|---|---|---|---|
| BPC-157 | 5 mg | 2 mL | 250 mcg | 2,500 mcg/mL | 0.100 mL | 10.0 units |
| BPC-157 | 5 mg | 2 mL | 500 mcg | 2,500 mcg/mL | 0.200 mL | 20.0 units |
| TB-500 | 5 mg | 2 mL | 2 mg | 2,500 mcg/mL | 0.800 mL | 80.0 units |
| Ipamorelin | 5 mg | 2 mL | 200 mcg | 2,500 mcg/mL | 0.080 mL | 8.0 units |
| CJC-1295 | 2 mg | 2 mL | 100 mcg | 1,000 mcg/mL | 0.100 mL | 10.0 units |
| Sermorelin | 6 mg | 3 mL | 200 mcg | 2,000 mcg/mL | 0.100 mL | 10.0 units |
| Tirzepatide | 5 mg | 1 mL | 2.5 mg | 5 mg/mL | 0.500 mL | 50.0 units |
Values are calculated from standard research protocol doses. Always verify with your specific vial label. Disclaimer
FREQUENTLY ASKED QUESTIONS
Everything you need to know about peptide reconstitution and dosing math.
What is bacteriostatic water?
Bacteriostatic water (BAC water) is sterile water containing 0.9% benzyl alcohol, which inhibits bacterial growth in multi-dose vials. It is the standard solvent for reconstituting research peptides. Never use tap water or plain sterile water for peptides, as they cannot prevent bacterial contamination across multiple draws.
What does "10 units on a U-100 syringe" mean?
Standard insulin syringes are calibrated for U-100 insulin, meaning 100 units equals 1 mL. The "10 units" marking on the barrel corresponds to 0.10 mL of fluid. This calculator converts your draw volume in mL to the matching unit marking on a standard insulin syringe, making measurement straightforward.
How much bacteriostatic water should I use?
Most researchers use 1–3 mL of BAC water per vial, with 2 mL being the most common. Less water creates a higher concentration (smaller draw volumes), while more water creates a lower concentration (larger draw volumes). For accuracy, aim for a draw volume of at least 5–10 units on the syringe — very small volumes are harder to measure precisely.
How long does reconstituted peptide last?
Most reconstituted peptides remain stable for 4–8 weeks when refrigerated at 2–8°C (36–46°F) and protected from light. Lyophilized (freeze-dried) powder is stable for years when stored properly at or below -20°C. Always discard reconstituted vials that appear cloudy or have visible particles.
What syringe size should I use?
0.3 mL or 0.5 mL insulin syringes (29–31 gauge, 6–8 mm needle) are preferred for most peptide doses, as the smaller barrel allows more precise measurement. Only upgrade to a 1 mL syringe when your calculated draw volume exceeds 0.5 mL.
Can I use this calculator for any peptide?
Yes. The reconstitution math applies universally to any lyophilized peptide regardless of the specific compound. Select a peptide from the dropdown to auto-fill the research dose, or enter your own values for unlisted compounds.
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RESEARCH DEEPER
Browse the full peptide library, compare two compounds side-by-side, or read research-backed protocols on the blog.