Where to Buy Bac Water [2026 Guide]

Where to Buy Bac Water [2026 Guide]. Where to buy bac water for research use: three verified vendors from $7.99 a vial, how bacteriostatic water differs from sterile water, and which size to pick. Key Takeaways Bacteriostatic water is not sterile water: the 0.9% benzyl alcohol preservative is what allows a vial to be punctured multiple times instead of used once and discarded Three verified places to buy: Licensed Peptides has the lowest listed price at $7.99 with a 30mL size also available, Peptide Supply Co carries it behind an account sign-in, and PSPeptides lists a medical-grade labelled vial at $9.99 Size should follow workload: 3mL suits occasional single-vial reconstitution, 10mL is the standard bench size, and 30mL only makes sense for high-volume laboratory work Check the vial before you trust it: an intact crimp seal, clear labelling that says "bacteriostatic water" with the benzyl alcohol content, and a legible lot and expiry are the minimum The clock starts at first puncture: once the stopper has been pierced, the common laboratory convention is a limited in-use window, not the printed expiry date Short answer: at the time of writing, the lowest listed price we track is Licensed Peptides at $7.99 a vial , with a 30mL size at $34.99 if you need volume. PSPeptides lists its vial at $9.99 under the name "Bacteriostatic (BAC) Water | Medical Grade". Peptide Supply Co also carries bac water, but its storefront sits behind a sign-in wall, so you will need to create an account before the product page or its pricing is visible. All three take a PeptideStack reader code. We also keep a dedicated bacteriostatic water product page with current vendor listings if you want the always-updated version of this comparison. Bacteriostatic water is the least glamorous item in a research supply order and one of the easiest to get wrong — either by accidentally buying plain sterile water, or by buying a size that does not match how much reconstitution work you actually do. This guide covers the three vendors we currently track, what separates bacteriostatic water from sterile water for injection, what to inspect before using any vial, and how to size the purchase correctly. Amino Club uses its own name for its documented bacteriostatic-water product. Our amino h20 vs bac water comparison checks the label and lot certificate, explains what is actually different, and shows when the branded option makes sense. Two sizes, lowest entry price Licensed Peptides $7.99 The lowest listed price of the three at the time of writing, with a 30mL size also listed at $34.99. Enter code PSTACK5 at checkout. View Bac Water at Licensed Peptides → Account required Peptide Supply Co Sign in to see pricing The storefront is behind a sign-in wall, so you will need to create an account before the product or its price is visible. Worth it if you already shop there. Code FDCF690L . View Bac Water at Peptide Supply Co → Medical-grade labelling PSPeptides $9.99 Listed on their site as "Bacteriostatic (BAC) Water | Medical Grade" at $9.99 at the time of writing — a mid price with their medical-grade labelling. Code PSTACK . View Bac Water at PSPeptides → Prices checked at the time of writing (August 2026). Vendor pricing and stock change; confirm on the product page before ordering. What Is Bacteriostatic Water? The short answer: water for injection with 0.9% benzyl alcohol added as a preservative. That single ingredient is the entire point of the product. Benzyl alcohol at that concentration inhibits bacterial growth inside the vial, which is what makes it acceptable — under proper aseptic technique — to draw from the same vial more than once. Plain water cannot offer that: once a non-preserved vial is punctured, anything introduced through the stopper can multiply unchecked. In research-peptide work, bacteriostatic water is the default reconstitution diluent. Lyophilized peptides ship as freeze-dried powder and have to be returned to solution before laboratory use, and because a single reconstituted vial is typically drawn from many times over days or weeks, a preserved diluent is the practical choice. The water itself contains no peptide, no active compound, and nothing else of note — it is a carrier, and the buying decision is correspondingly simple: verified labelling, an intact seal, and a sensible size — though some peptide vendors also sell their own diluent, like the 30ml Reconstitution Solution at $19.97 we cover in our BioLongevity Labs review , which is worth price-checking against the standalone vendors below. Bacteriostatic Water vs Sterile Water for Injection The short answer: the preservative is the difference, and it changes how each product can be used. Sterile water for injection is exactly what it sounds like — sterilized water in a sealed vial with nothing added. It is sterile until the moment the stopper is first pierced, and because nothing in it suppresses bacterial growth, it is treated as single-use: puncture once, use, discard the remainder. Bacteriostatic water starts from the same base but adds the 0.9% benzyl alcohol preservative, which is what supports a multi-use in-use window. Property Bacteriostatic water Sterile water for injection Preservative 0.9% benzyl alcohol None Vial use Multi-dose (repeated draws with aseptic technique) Single use, discard after opening Typical research role Default peptide reconstitution diluent Situational, where a preservative-free diluent is required In-use window after puncture Limited window by laboratory convention Effectively none — use immediately The practical consequence for storage is significant: a peptide reconstituted with bacteriostatic water is conventionally treated as usable for around 28 days refrigerated, while the same peptide in plain sterile water should be treated as a much shorter-lived preparation. Our guide on how long reconstituted peptides last works through that distinction in detail, including handling and temperature variables. Where to Buy Bac Water: The Three Vendors Compared Licensed Peptides — two sizes, competitive entry price Licensed Peptides lists bacteriostatic water at $7.99 at the time of writing , the lowest listed price of the three vendors we track, and separately lists a 30mL vial at $34.99 for higher-volume work. That two-size lineup is the practical draw: you can start with the standard vial and step up to 30mL only if your bench workload genuinely calls for it. Enter reader code PSTACK5 at checkout to apply the discount. Peptide Supply Co — if you have (or want) an account there Peptide Supply Co carries bacteriostatic water, but one thing to know before you click through: the storefront is behind a sign-in wall , so the product page and its pricing are not visible until you create an account. That is simply how their shop works, not a mark against the product — but it does mean we cannot quote a price here, and you should expect a short registration step before you can see or order anything. It makes the most sense if you already have an account there or plan to order other items from them anyway. Reader code FDCF690L applies at checkout. PSPeptides — medical-grade labelling at a mid price PSPeptides lists its vial as "Bacteriostatic (BAC) Water | Medical Grade" at $9.99 at the time of writing . That medical-grade labelling — their wording on the listing — is the differentiator for buyers who want that designation stated on the product page, at a price that sits in the middle of the three. Code PSTACK applies at checkout. Current codes for all three vendors, along with the rest of the suppliers we track, live on our peptide coupon codes page. What to Look For When Buying Bac Water The short answer: an intact seal, honest labelling, and a size you will actually finish. Because bacteriostatic water is a low-cost commodity, the buying checklist is short but non-negotiable: Sealed vial: the aluminium crimp and flip-cap should be intact on arrival. A vial with a damaged crimp, a punctured stopper, or any evidence of prior opening should not be used, whatever the vendor. Clear labelling: the label should state "bacteriostatic water" and disclose the benzyl alcohol content. If a listing or label is ambiguous about whether the product is bacteriostatic or plain sterile water, treat that ambiguity as the answer and buy elsewhere. Lot number and expiry: both should be printed and legible. An unopened vial past its printed expiry should be replaced, not rationalized. Reasonable size for the work: an oversized vial is not a bargain if the in-use window expires long before the water is used up — sizing is covered next. What Size Should You Buy: 3mL, 10mL or 30mL? The short answer: buy for your reconstitution volume, not for the price per millilitre. A typical research peptide vial is reconstituted with 1mL to 3mL of bacteriostatic water, so the arithmetic is easy to run before ordering. A 3mL vial covers one to two peptide reconstitutions and suits someone who mixes occasionally and would rather open a fresh vial each time. A 10mL vial is the standard bench size — enough for several reconstitutions inside a single in-use window without leaving most of the vial stranded. A 30mL vial, like the $34.99 option Licensed Peptides lists, only makes sense for genuinely high-volume laboratory work where many vials are being reconstituted in a short period. The common mistake is buying big for value and then holding a punctured 30mL vial well past its sensible in-use window. If you are unsure, work backwards from the vials on your bench: our bac water calculator converts a target concentration into the exact volume each peptide vial needs, which tells you how much water a month of work actually consumes. Storage and Expiry After First Puncture The short answer: the printed expiry governs the sealed vial; the first puncture starts a different, shorter clock. Unopened, bacteriostatic water is stable at controlled room temperature until the expiry on the label — refrigeration is not required for the sealed vial. Once the stopper has been pierced, the preservative suppresses bacterial growth but does not make the vial invulnerable, and the common laboratory convention is to treat a punctured vial as usable for a limited window — 28 days is the figure most multi-dose handling guidance converges on — and then discard whatever remains. Handling habits matter as much as the calendar: use a fresh sterile syringe and needle for every draw, swab the stopper beforehand, never return withdrawn liquid to the vial, and write the date of first puncture on the label so the window is tracked rather than guessed. Discard any vial whose contents turn cloudy or show particulates, regardless of date. Note that these conventions govern the water itself; a peptide solution mixed from it has its own, compound-dependent stability profile on top. Frequently Asked Questions Where is the cheapest place to buy bac water? Of the vendors PeptideStack tracks, Licensed Peptides has the lowest listed price at $7.99 per vial at the time of writing (code PSTACK5), with a 30mL size at $34.99. PSPeptides lists its medical-grade labelled vial at $9.99 (code PSTACK). Peptide Supply Co also carries bac water, but its storefront requires creating an account before the product or pricing is visible. Is bacteriostatic water the same as sterile water? No. Sterile water for injection contains no preservative and is single-use: once punctured, the remainder should be discarded. Bacteriostatic water adds 0.9% benzyl alcohol, which inhibits bacterial growth inside the vial and supports repeated draws over a limited in-use window with proper aseptic technique. Can you use sterile water instead of bacteriostatic water to reconstitute peptides? A peptide can be dissolved in either, but the resulting solutions are not equivalent for storage. A preparation in plain sterile water has no preservative and should be treated as very short-lived, while bacteriostatic water preparations are conventionally handled on a roughly 28-day refrigerated window. For multi-draw research vials, bacteriostatic water is the standard choice. How long does bac water last after opening? The common multi-dose convention is a limited in-use window from the date of first puncture — 28 days is the figure most handling guidance uses — after which the remainder is discarded even if liquid is left. The printed expiry date applies only to the sealed, unopened vial. Dating the label at first puncture is the simplest way to track the window. What size of bacteriostatic water should I buy? Match the vial to your reconstitution volume: 3mL covers one or two peptide reconstitutions, 10mL is the standard bench size for regular work, and 30mL suits only high-volume laboratories. Because a punctured vial has a limited in-use window, an oversized vial that expires half-full is not a saving. Do I need a prescription to buy bacteriostatic water? No. Bacteriostatic water is sold as a laboratory supply item by research vendors and does not require a prescription. It contains no active drug — it is water with a 0.9% benzyl alcohol preservative, used in research settings as a reconstitution diluent. Affiliate disclosure: Some links in this article are affiliate links. PeptideStack may earn a commission at no extra cost to you. This article is educational only and discusses research-use products, not medical treatments or products for human consumption. 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