Reconstituting a peptide vial? Enter your vial size and BAC water volume to get your concentration, calculate units to draw for your dose, and print a label for your vial.
Important Disclaimer: This calculator is for informational purposes only and is NOT a substitute for professional medical advice. Always verify your dose with your healthcare provider. Productist LLC is not responsible or liable for any consequences of using this tool.
New to reconstituting peptides? Here's what you need to know.
Your peptide arrives as a freeze-dried powder — it needs to be mixed with bacteriostatic (BAC) water before you can inject it. This mixing process is called reconstitution. GLP-1 medications like tirzepatide, semaglutide, and retatrutide are stored as powder because it keeps them stable longer.
Wipe the vial top with an alcohol swab. Draw your calculated amount of BAC water into a syringe, then inject it slowly down the inside wall of the vial — don't squirt it directly onto the powder. Gently swirl the vial until the powder is fully dissolved. Never shake it. The amount of water you add determines your concentration, which determines how many units equal your dose.
Use clean hands and sterile supplies. Once mixed, your vial must be refrigerated (36–46°F / 2–8°C) and is typically good for 28–60 days depending on the medication. Don't freeze it. Before each use, take a quick look at the liquid — if it's cloudy, has particles, or looks discolored, don't use it.