BAC Water: What It Is, FDA Status & Reconstitution Math
By James Li, Lead Editor · Updated · Reviewed
Quick answer
Bacteriostatic water is sterile water with benzyl alcohol, which is why a multi-use bottle is not discarded after one needle entry, and it is the liquid you add to a dry vial rather than something you reconstitute itself.
Once you have milligrams on the label and the milliliters of water you added, concentration is those milligrams divided by those milliliters, and a U-100 syringe reads that volume as 100 units per milliliter, so 10 units is 0.1 mL while one milligram is 1,000 micrograms. Many labels limit an opened bottle to 28 days, so follow the date on the bottle you have.
Blends
Optional. Extra peptides are added to the vial total.
Waiting on Input
5 mg vial, 2 mL water, 250 mcg. Example only, not a dose.
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Illustrative arithmetic only, not a recommendation. The result for BAC water uses only the numbers you type.
What is BAC water?
BAC water is bacteriostatic water, which is the liquid added to a dry vial rather than a peptide itself.
The preservative is benzyl alcohol, which is why a multi-use bottle is not thrown out after a single needle entry, and you add a volume of it to a dry peptide vial rather than mixing water into water, since BAC water itself is not a peptide.
What is the FDA status of BAC water?
Bacteriostatic water is sold as a sterile diluent, so match your bottle to its own label.
The calculator does not grant or remove an approval and only divides the milligrams you enter by the milliliters you enter, so check Drugs@FDA or DailyMed for the product name on your label.
How is BAC water reconstituted?
You do not reconstitute bacteriostatic water, because it is already a liquid.
You draw a volume you chose and add it to a dry vial, then enter the milligrams that were in that vial and the milliliters you actually added, and the calculator reports mg/mL from those two entries without telling you which volume to draw.
How do you convert BAC water mg to mcg and syringe units?
For bacteriostatic water, multiply milligrams by 1,000 to get micrograms.
That conversion does not produce a syringe mark, because units measure volume and you still divide the micrograms you want to measure by the micrograms in each milliliter.
How should BAC water be stored?
Store the bottle as its label says and discard it by the date printed there.
After the seal is broken, many bacteriostatic water labels limit use to 28 days, and a peptide vial you mixed with that water can carry a different instruction, so read the vial label separately.
Where can I find primary sources on BAC water?
For the approval status of bacteriostatic water, start with Drugs@FDA and the product label on DailyMed.
Those are the places that say whether a named product is approved and what its label claims, and this page does not recap studies or change the calculator because of them.
Unit math
Illustrative arithmetic only. Not a dose. Barrel columns use a U-100 scale, 100 units per mL.
| Vial mg | Water mL | mg/mL | mcg/mL | mcg in 10 units |
|---|---|---|---|---|
| 5 | 2 | 2.5 | 2,500 | 250 |
| 5 | 1 | 5 | 5,000 | 500 |
| 10 | 2 | 5 | 5,000 | 500 |
| mL | 1 mL barrel (U-100 scale) | 0.5 mL barrel (U-100 scale) | 0.3 mL barrel (U-100 scale) |
|---|---|---|---|
| 0.05 | 5 | 5 | 5 |
| 0.1 | 10 | 10 | 10 |
| 0.25 | 25 | 25 | 25 |
| 0.5 | 50 | 50 | 50 (past barrel) |
| 1 | 100 | 100 (past barrel) | 100 (past barrel) |
FAQ
What is BAC water?
BAC water is bacteriostatic water, which is sterile water with a preservative used to dissolve a dry vial, and the volume you add is what sets the concentration.
What is bacteriostatic water?
BAC water is bacteriostatic water, which is sterile water with a preservative used to dissolve a dry vial, and the volume you add is what sets the concentration.
Does BAC water go bad?
Use the expiration date on the bottle, and after opening follow the in-use time on that same label, which for many bacteriostatic water bottles is 28 days after first use.
Is BAC water FDA approved?
Bacteriostatic water is sold as a sterile diluent, so match your bottle to its own label.
How do I use the BAC water calculator?
Type the milligrams on the vial, the milliliters of water you added, and the amount you want to measure, and the syringe mark updates in the calculator.
Sources
- Drugs@FDA, FDA
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Topics
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