Reconstitution Water

Reconstitution water is the sterile diluent used to turn a lyophilized (freeze-dried) research peptide back into a stable liquid. In most peptide work it is the same product commonly sold as bacteriostatic water: sterile water carrying 0.9% benzyl alcohol as a bacteriostatic preservative. That preservative inhibits bacterial growth so a single vial can be accessed repeatedly for up to 28 days without rapid contamination. The reconstitution water and bacteriostatic water sold at Peptides Please are the same research-grade solution under two names our customers search for. All of it is supplied strictly for laboratory research use and is not for human or animal use.

Key Takeaways

• Reconstitution water and bacteriostatic water refer to the same core product: sterile water with 0.9% benzyl alcohol.
• The 0.9% benzyl alcohol is a bacteriostatic preservative that lets a multi-use vial stay usable for up to 28 days after the first puncture, per standard USP handling.
• It is the standard diluent for dissolving lyophilized research peptides such as BPC-157, CJC-1295 and GHK-Cu.
• Plain sterile water has no preservative and is single-use only; bacteriostatic water is preferred when a vial will be accessed more than once.
• Everything here is research-use-only, not for human or animal use, and Peptides Please ships to the USA and Canada.

What Is Reconstitution Water?

Reconstitution water, also called reconstitution solution or bacteriostatic water, is a sterile laboratory-grade diluent. The common form is roughly 99.1% sterile or deionized water with 0.9% benzyl alcohol added as a bacteriostatic preservative to inhibit bacterial growth during repeated access. It is designed to dissolve lyophilized powders such as research peptides and proteins into a stable solution, keeping that solution usable across multiple withdrawals over about 28 days when stored correctly. Unlike plain sterile water, which has no preservative and is single-use, reconstitution water holds its integrity for controlled, repeat-access laboratory work.

Shop reconstitution water below and add a vial to your order before you check out.

Is Reconstitution Water the Same as Bacteriostatic Water?

In day-to-day peptide research the two names point to the same working solution, which is why we consolidated both under one page. There is a narrow technical distinction worth knowing: “reconstitution solution” can also describe a diluent tailored in pH or tonicity to one specific compound, while “bacteriostatic water” specifically means sterile water preserved with 0.9% benzyl alcohol. For the vast majority of lyophilized research peptides, bacteriostatic water is the standard choice because its preservative allows safe repeat access to the vial. If you want the fuller comparison, read our breakdown of reconstitution solution versus bacteriostatic water.

What Is Reconstitution Water Used For?

Its single job is dissolving lyophilized research compounds into a stable liquid without introducing contamination. Because the 0.9% benzyl alcohol prevents bacterial proliferation during repeated needle punctures, one vial can supply many reconstitutions across its usable window. That makes it the default diluent for growth-hormone secretagogues, recovery peptides and metabolic research peptides that ship in freeze-dried form. For step-by-step handling, see how to mix bacteriostatic water with peptides and how much bacteriostatic water to add to peptides.

How Reconstitution Water Works

Freeze-dried peptides are shipped lyophilized to preserve stability in storage. Adding reconstitution water slowly rehydrates the powder so it dissolves into solution while the molecule keeps its structure and activity. The benzyl alcohol works by preventing bacterial reproduction rather than killing microbes outright, which keeps the vial in a stable “static” state through repeated withdrawals. During peptide reconstitution it also helps hold pH steady and reduces degradation of sensitive compounds over time. Direct the water down the vial wall rather than onto the powder to protect fragile peptides.

Sterile Water vs Bacteriostatic Water vs Saline

Choosing the diluent matters. Plain sterile water is pure, preservative-free, and single-use, which suits a compound that will be used immediately but offers no protection across repeated access. Normal saline (0.9% sodium chloride) adds sodium ions that can slow dissolution or unsettle peptides prone to precipitation. Bacteriostatic water sits in the middle for most research: preserved for multi-use, gentle on typical peptides, and stable for up to 28 days. Two deeper comparisons live here: bacteriostatic water vs sterile water and bacteriostatic water vs saline.

Storage and Handling

Store reconstitution water in its original sterile vial at room temperature, keep the stopper clean, and use within about 28 days of the first puncture. Discard the vial if the liquid turns cloudy or discolored, and never treat a preserved multi-use vial as a substitute for a single-use preservative-free product where a protocol calls for one. Reconstituted peptides themselves usually belong in the refrigerator; the water before use does not. For specifics, see how to store bacteriostatic water and how long bacteriostatic water is good for.

Pairs With the Peptides You Already Research

Reconstitution water is the companion buy for almost any lyophilized compound in the catalogue. Researchers reconstituting recovery peptides like BPC-157, growth-hormone secretagogues like CJC-1295, or copper peptides like GHK-Cu all need a sterile diluent on hand first.

Add a vial of reconstitution water to your peptide order now so nothing sits unusable while you wait on a second delivery.

Frequently Asked Questions

Is reconstitution solution the same as bacteriostatic water?

For most peptide research, yes: the reconstitution water sold here is bacteriostatic water, sterile water preserved with 0.9% benzyl alcohol. The only nuance is that “reconstitution solution” can sometimes describe a diluent tuned to one specific compound.

What is reconstitution water made of?

It is roughly 99.1% sterile water combined with 0.9% benzyl alcohol, which acts as a bacteriostatic preservative to inhibit bacterial growth during repeated vial access.

How long is a vial good for after opening?

Standard USP handling puts the usable window at up to 28 days after the first puncture when the vial is stored correctly at room temperature and kept sterile.

Can I use plain sterile water instead?

Sterile water has no preservative and is intended for single use, so it does not protect a vial that will be accessed multiple times. Bacteriostatic water is preferred whenever a vial is punctured more than once.

Does reconstitution water need refrigeration?

The unopened water is stored at room temperature; refrigeration generally applies to the reconstituted peptide afterward. See our guide on whether bacteriostatic water needs to be refrigerated.

Buy Reconstitution Water at Peptides Please

Peptides Please stocks research-grade reconstitution water (bacteriostatic water) with 0.9% benzyl alcohol, sterile-filtered for consistent, repeatable results in the lab. It is supplied for research use only and is not for human or animal use.

Order your reconstitution water below and keep a sterile diluent ready for every lyophilized peptide on your bench.