# Bac Water vs Sterile Water for Peptides

Source: https://www.philippinespeptides.com/faq/bac-water-vs-sterile
Updated: 2026-10-01

> Bacteriostatic vs sterile water for reconstituting peptides: what each contains, where the 28-day in-use limit comes from, and registration in the Philippines.

On this page

- [Quick Comparison](#comparison)

- [The Verdict](#verdict)

- [What NOT to Use](#avoid)

- [Where to Source](#sourcing)

- [Risks & disclaimer](#risk)

- [FAQ](#faq)

- [Sources](#sources)

- [Related guides](#related)

Faq · Solvents

# Bacteriostatic Water vs Sterile Water

Philippines Peptides editorial desk Updated 1 October 2026 4 min read

**Topic**

- Reconstitution Solvents

**Scope**

- Bacteriostatic vs Sterile

**Audience**

- Beginner · Intermediate

## Quick Comparison

| Property | Bacteriostatic Water | Sterile Water |
| --- | --- | --- |
| Contains | 0.9% benzyl alcohol as a preservative | No preservative |
| After first entry | Discard within 28 days (CDC, USP <797>) | Single use; unused portion discarded (label) |
| Vial entered more than once | Yes, what it is made for | No |
| Suppresses microbial growth | Yes | No |
| Labelled for | Multiple-dose use | Single-dose use |

## The Verdict

Note

Our partner and supplier Primara Labs lists bacteriostatic water 3ml at PHP 270. [Buy bacteriostatic water in the Philippines](https://www.primaralabs.com/marketplace/bac-water-3ml?utm_source=philippinespeptides&utm_medium=referral&utm_campaign=inline)

## What NOT to Use

Warning

- • **Tap water**: not sterile

- • **Distilled or drinking water**: not sterile and not made for injection

- • Any water not specifically labelled for injection

Registration first

## Where to Source BAC Water in PH

Bacteriostatic water for injection is a pharmaceutical product. Under RA 9711 a drug must be registered with FDA Philippines before it is imported, sold or distributed; the [regulation hub](https://www.philippinespeptides.com/legal) covers the law. The FDA Verification Portal at [verification.fda.gov.ph](https://verification.fda.gov.ph/) shows which bacteriostatic and sterile water products are registered.

- FDA-licensed pharmacies: under RA 10918, pharmaceutical products may be sold to the public only through an FDA-licensed retail drug outlet

- Primara Labs, our partner and supplier, which lists bacteriostatic water alongside its research vials

Reconstitution is sterile work

## Risks & disclaimer

Caution

Bacteriostatic water suppresses microbial growth; it does not sterilise a contaminated vial. The in-use period assumes aseptic handling of the vial: a swabbed stopper and a sterile needle for every entry. Any vial that turns cloudy, shows particles or changes colour is discarded, whatever the date.

Benzyl alcohol is the reason bacteriostatic water is not used in preparations for newborns: the US FDA linked benzyl alcohol exposure in neonates to the fatal “gasping syndrome” in 1982 (SRC-02). Product labelling also lists hypersensitivity to benzyl alcohol.

None of this is medical advice. Anyone with a known benzyl alcohol allergy should raise it with a licensed Philippine physician.

## FAQ

### Bacteriostatic water or sterile water for reconstituting peptides?

Bacteriostatic water for injection contains 0.9% benzyl alcohol, a preservative that suppresses microbial growth in a vial that is entered more than once. CDC guidance and USP General Chapter 797 set 28 days after first entry as the default discard date for an opened multiple-dose vial. Sterile water for injection has no preservative and is labelled for single use, with the unused portion discarded. For a vial that will be entered more than once, bacteriostatic water is the solvent designed for it.

### Where can bacteriostatic water be sourced in the Philippines?

Bacteriostatic water for injection is a pharmaceutical product. Under RA 9711 a drug must be registered with FDA Philippines before it is imported, sold or distributed, and the FDA Verification Portal at verification.fda.gov.ph shows which solvent products are registered. Under RA 10918, pharmaceutical products may be sold to the public only through an FDA-licensed retail drug outlet. Primara Labs, our partner and supplier, lists bacteriostatic water alongside its research vials.

CDC, USP, FDA

## Sources

- SRC-01 US Centers for Disease Control and Prevention, Injection Safety: Questions about multi-dose vials (cdc.gov), and United States Pharmacopeia General Chapter <797> Pharmaceutical Compounding: Sterile Preparations: 28 days after first entry as the default discard date for an opened multiple-dose vial unless the manufacturer states otherwise.

- SRC-02 US Food and Drug Administration, 1982 warning on benzyl alcohol-preserved solutions in neonates (“gasping syndrome”). [fda.gov](https://www.fda.gov/)

- SRC-03 Bacteriostatic Water for Injection, USP, and Sterile Water for Injection, USP, product labelling (DailyMed, dailymed.nlm.nih.gov): 0.9% benzyl alcohol in the bacteriostatic product; no preservative and single-dose use for sterile water.

- SRC-04 FDA Philippines Verification Portal. [verification.fda.gov.ph](https://verification.fda.gov.ph/): the register for which sterile and bacteriostatic water products are registered in the Philippines.

## Related guides

Our partner and supplier

### Bacteriostatic water from our partner and supplier

Primara Labs, our partner and supplier, lists bacteriostatic water 3ml at PHP 270 alongside its research vials. Delivery is same day for Metro Manila orders placed before 12 noon and 1 to 5 business days elsewhere, and every order gets 10% off.

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Philippines Peptides sells nothing. Primara Labs is our partner and supplier. This is general information, not medical or legal advice.