Reconstitution & Vials
Lyophilized
Also called: freeze-dried, freeze dried
Definition
Freeze-dried: a form in which water has been removed from a product under controlled conditions.
What Lyophilized means
Lyophilization is used to produce a dry material that may later be reconstituted according to the product's instructions or research context.
Why the distinction matters
Seeing a dry cake or powder does not by itself tell you the product's identity, purity, stability, or appropriate preparation method.
Common confusion
Lyophilized describes the physical processing state of a product. It does not mean that every lyophilized vial should be handled the same way.
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Related glossary terms
Reconstitution & Vials
Reconstitution
The process of adding a liquid to a dry or lyophilized product so that it becomes a solution or suspension with a calculable concentration.
Reconstitution & Vials
Bacteriostatic Water
Sterile water for injection that contains an antimicrobial preservative intended to inhibit bacterial growth after entry into the vial.
Reconstitution & Vials
Sterile Water
Sterile water for injection that does not contain the bacteriostatic preservative found in bacteriostatic water.
Published September 6, 2026. BACToBasics glossary pages are educational definitions only and do not provide medical, dosing, preparation, treatment, or product-selection advice.