Reconstitution Guide

What is reconstitution?#

Many peptides come as freeze-dried (lyophilized) powder and need to be mixed with bacteriostatic water (BAC water) before injection. This process is called reconstitution. The ratio of powder to water determines your concentration.

BAC water basics#

Bacteriostatic water contains 0.9% benzyl alcohol as a preservative, which prevents bacterial growth. This is why it's preferred over sterile water — it allows the reconstituted peptide to last longer. A single vial of BAC water (30mL) can reconstitute multiple peptide vials.

Use the Reconstitution Calculator in the app to determine exactly how much BAC water to add for your desired concentration per tick mark.

How to reconstitute#

Draw your measured BAC water into an insulin syringe. Insert the needle into the peptide vial and slowly let the water trickle down the inside wall — never squirt directly onto the powder. Gently swirl (don't shake) until fully dissolved. The solution should be clear.

Storage after reconstitution#

Reconstituted peptides must be refrigerated (2-8 C / 36-46 F). Most have a shelf life of 14-28 days after reconstitution. Never freeze reconstituted peptides. Track your vial dates in the Inventory section — the app will alert you when a vial is nearing expiry.