Should I use 1 mL, 2 mL, or 3 mL of BAC water?
BAC water amount changes concentration, not total peptide. Less water gives a stronger liquid and a smaller unit draw. More water gives a more diluted liquid and a larger unit draw that is easier to read.
What changes
- 1 mL gives the most concentrated liquid.
- 2 mL is the common middle ground for many peptide vials.
- 3 mL makes small doses easier to measure.
- 5 mL can help tiny draws, but may not fit every vial comfortably.
What does not change
The number of total doses does not change. A 10 mg vial still contains 10,000 mcg whether it is mixed with 1 mL, 2 mL, or 3 mL.
Practical rule
Pick the amount that makes your per-dose unit draw readable without forcing a very large injection volume.
Pepdex is an educational reference, not medical advice. Peptides vary in legal, approval, and evidence status. This answer is meant to explain the concept, not prescribe a protocol or replace a qualified clinician.
Helpful next pages
More dose math answers
Last updated 2026-07-07.