Question 1

How much bacteriostatic water should I add to my peptide vial?

Accepted Answer

There's no single correct amount — it depends on your target dose and syringe precision. The goal is to add enough water that your dose falls within an easily measurable range on your syringe (typically 5-20 units). For a 5mg vial with a 250mcg target dose, adding 2mL of BAC water gives you 10 units per dose — easy to measure accurately. Our calculator finds the optimal dilution for your specific situation.

Question 2

What is the difference between bacteriostatic water and sterile water?

Accepted Answer

Bacteriostatic water contains 0.9% benzyl alcohol as a preservative, which inhibits bacterial growth and allows the solution to be used multiple times over several weeks. Sterile water has no preservative and must be used immediately or discarded. For peptides that require multiple injections from one vial, always use bacteriostatic water.

Question 3

How do I convert mL to insulin syringe units?

Accepted Answer

Standard insulin syringes use "units" where 100 units = 1mL. So 0.1mL = 10 units, 0.05mL = 5 units, and so on. This is why reconstitution math gets confusing — you need to calculate the peptide concentration (mcg/unit) based on your dilution, then determine how many units equals your target dose. Our calculator handles all of this automatically.

Question 4

Can I use the same syringe to reconstitute and inject?

Accepted Answer

For reconstitution, you can use any sterile syringe with a needle that fits through the vial stopper. For subcutaneous injection, most people prefer insulin syringes with 29-31 gauge needles. Many use a larger syringe for reconstitution and smaller insulin syringes for daily injections.

Question 5

How long does reconstituted peptide last?

Accepted Answer

Most peptides remain stable for 4-6 weeks when reconstituted with bacteriostatic water and stored refrigerated (2-8°C / 36-46°F). Some peptides like BPC-157 may degrade faster (2-3 weeks). Never freeze reconstituted peptides, and avoid temperature fluctuations. If the solution becomes cloudy or shows particles, discard it.

Question 6

What happens if I add too much or too little water?

Accepted Answer

Adding more water makes the solution more dilute — you'll need to inject larger volumes to get the same dose, but it's easier to measure small doses precisely. Adding less water makes it more concentrated — smaller injection volumes, but harder to measure accurately. Neither is dangerous, but very concentrated solutions can be harder to work with. Our calculator helps you find the sweet spot.

Question 7

Why does the powder stick to the vial after adding water?

Accepted Answer

This usually happens when you spray the water directly onto the powder instead of letting it run down the glass wall. The force can splash peptide onto the sides where it won't dissolve properly. If this happens, gently tilt and swirl the vial (don't shake) until all the powder is in solution. Next time, inject the water more slowly against the glass.

Question 8

Do different peptides require different reconstitution techniques?

Accepted Answer

The basic technique is the same for all lyophilized peptides: gentle addition of BAC water, no shaking, refrigerated storage. However, some peptides (like certain GH secretagogues) are more fragile and benefit from extra care. Our calculator includes peptide-specific guidance and alerts you to any special handling requirements.

Never waste another vial.