Question 1

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

Accepted Answer

The amount of water depends on your vial size and prescribed dose. Our calculator determines the optimal water volume so your dose lands on an easy-to-read syringe tick mark. Common volumes range from 1 mL to 3 mL.

Question 2

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

Accepted Answer

Adding more water creates a lower concentration. Adding less water creates a higher concentration. Neither changes the total amount of peptide in the vial, just the concentration per mL.

Question 3

Can I use regular water instead of bacteriostatic water?

Accepted Answer

No. Regular water is not sterile. Bacteriostatic water contains 0.9% benzyl alcohol as a preservative, allowing multi-use over approximately 28 days.

Question 4

How do I know what syringe size to use?

Accepted Answer

Most peptide doses use a U-100 (1 mL) insulin syringe. If your dose is very small (under 15 units), a U-30 (0.3 mL) syringe provides finer markings.

Question 5

What's the difference between mg and mcg?

Accepted Answer

1 mg (milligram) = 1,000 mcg (micrograms). Vial sizes are typically in mg, individual doses are often in mcg.

Tirzepatide Guide

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