Good morning. Bacteriostatic water is gone from Amazon. No announcement, no recall, just missing listings where there used to be a commodity product. If you reconstitute research peptides, this matters to you.

What happened

Independent testing by Peptide Crafters evaluated 11 BAC water products sold on Amazon in early 2026. Two passed. The rest failed on pH, benzyl alcohol concentration, or both.

Acceptable pH for bacteriostatic water runs from roughly 4.5 to 7.0. Several of the failing products came in at 8.5, 8.69, and 8.8. Water that alkaline degrades sensitive peptides before they reach their intended use. Some products also failed on benzyl alcohol content (the ingredient responsible for keeping an open vial stable in the refrigerator for up to 28 days).

The products being sold as bacteriostatic water were frequently not bacteriostatic water.

Amazon removed the listings. The quality data tells the real reason.

Where to source it now

A few categories worth knowing. Peptide-dedicated vendors are a natural first choice: their incentive structure aligns with quality, because a vendor selling substandard BAC water alongside peptides is degrading both at once. Nationwide Peptides, Ion Peptide, and Heritage Labs USA are all carrying USP-grade BAC water with domestic manufacturing. Dedicated reconstitution suppliers have also stepped into the gap. Bacteriostaticwater.com carries exactly one product, done well. For the most verified option, Pfizer's Hospira bacteriostatic water for injection (USP) is the pharmaceutical-grade benchmark and is available through PeptideTest.com.

On price: expect $20 to $30 for 30 mL from a reputable source. Significantly less than that, and you should ask where the savings are coming from.

What to look for

The minimum you should expect from any BAC water source: a USP-grade designation, 0.9% benzyl alcohol stated explicitly, domestic or equivalent pharmaceutical manufacturing, and a COA available on request. pH should fall between 4.5 and 7.0. If a vendor cannot tell you the pH and benzyl alcohol percentage of what they are selling, keep looking.

Still owe you the vial-size math from No. 01. Next Saturday.