Peptide Reconstitution Calculator
Enter your peptide, vial size, and target dose below. The calculator shows exactly how much BAC water to add, how many units to draw in an insulin syringe, and how many doses you get per vial.
Frequently Asked Questions
What is bacteriostatic water and why does it matter?
Bacteriostatic water (BAC water) contains 0.9% benzyl alcohol, which prevents microbial growth after the vial is opened. It is the standard diluent for peptide reconstitution because it keeps the solution sterile across multiple draws. Do not use tap water, saline, or sterile water for injection — these do not preserve the peptide between uses.
How much BAC water should I add to my vial?
2 mL is the most common choice for standard 5 mg vials. For 10 mg vials, 3 mL gives a convenient concentration. The exact amount does not affect potency — only the concentration changes, which changes how many units you draw per dose. Use the calculator above to find the right unit count for any volume you choose.
What syringe type does this calculator assume?
U-100 insulin syringes, which are the standard for subcutaneous peptide administration in research. These are marked in units (U) from 0 to 100, where 100 units = 1 mL. Our research supplies kits include 29G x 1/2″ insulin syringes compatible with this calculator’s output.
How long is a reconstituted peptide stable?
Most peptides reconstituted in BAC water remain stable for 4-6 weeks when stored at 2-8C (standard refrigerator temperature). Do not freeze after reconstitution. Lyophilized (powder) peptides can be stored at -20C for 12-24 months when kept dry and away from light.
What is the difference between mcg and mg?
1 mg = 1,000 mcg. Most peptides like Ipamorelin and BPC-157 are dosed in micrograms (mcg), while some like MOTS-C are dosed in milligrams (mg). The calculator handles both — just enter the number and select the correct unit from the dropdown.
Do I need to swab the vial septum before drawing?
Yes. Wipe the rubber septum with an alcohol prep pad and allow it to dry for 10-15 seconds before inserting any needle. This applies to both the BAC water vial and the peptide vial. Our research supplies kits include 70% IPA prep pads for this purpose.
How to use this calculator
Choose from the dropdown. The vial size and typical dose range populate automatically based on the product you ordered.
Most researchers use 2 mL or 3 mL of bacteriostatic water per vial. Higher volumes give finer dosing increments; lower volumes mean fewer injections per vial.
Input your dose in mcg or mg. The calculator converts this to units on a U-100 insulin syringe and shows how many doses you can draw from one vial.
Draw to the exact unit shown on your syringe. Write down your reconstitution ratio so every future dose is consistent.
Need supplies for reconstitution?
Every Northstate Labs order ships with a CoA. Add these to complete your research setup.