Glossary
Reconstitution
Also called Reconstituting, Mixing a peptide, Mixing a vial
Adding a sterile liquid, usually bacteriostatic water, to a vial of freeze-dried peptide powder so it becomes an injectable solution with a known strength.
In more detail
Most research peptides ship as a dry powder (a lyophilized cake) because they keep far longer that way. Reconstitution turns that powder into a liquid you can draw with a syringe. The amount of water you add sets the concentration: the same 5 mg vial mixed with 1 mL or with 2.5 mL holds the same peptide, but every unit on the syringe carries a different dose.
The technique most guides agree on: let the vial reach room temperature, swab both rubber stoppers, add the water slowly down the inside wall of the vial instead of blasting the powder, then swirl or roll gently until it clears. Shaking is the most common mistake people warn about. A finished solution should be clear; cloudiness or floating particles are a reason to stop.
Why it matters
The water volume you pick is the number every later dose depends on. Write it on the vial with the date, and let our reconstitution calculator do the unit math. The full walkthrough is in How to reconstitute peptides.
Related terms
- Bacteriostatic waterSterile water with a small amount of benzyl alcohol added as a preservative, so a vial can be punctured more than once. It is the default liquid for mixing multi-dose peptide vials.
- LyophilizedFreeze-dried. The peptide is frozen and its water removed under vacuum, leaving a dry powder or cake in the vial that is mixed with liquid before use.
- Units vs mg vs mcgMilligrams (mg) and micrograms (mcg) measure how much peptide you take. Syringe units measure how much liquid you draw. You need the vial's concentration to convert one into the other.
- U-100 insulin syringeThe small insulin syringe most people use for peptides. Its scale is marked in units, where 100 units equals 1 mL, so 1 unit is 0.01 mL of liquid.
- Sterile techniqueThe set of habits that keep germs out of a vial, syringe and injection site: clean hands, swabbed stoppers and skin, new needles, and never touching anything that should stay sterile.
- Peptide stabilityHow long a peptide keeps its structure and strength. It depends on the molecule, whether it is dry or in solution, temperature, light and handling.
Peptides where this comes up
Sources
Each source is labeled by where the information comes from. How we label sources
- Competitor guideHow to reconstitute peptides: step-by-step guide(opens in a new tab)
peptiq.io · checked
- Reference workDrawing medicine out of a vial(opens in a new tab)
MedlinePlus (U.S. National Library of Medicine) · checked
- Competitor guideSyringe measurement guide(opens in a new tab)
peptidedosages.com · checked
Updated