How long will my peptide vial last?
A vial lasts total mcg in the vial divided by mcg per dose. Then divide that dose count by how often you use it. BAC water changes the unit draw, but it does not change how many total doses are in the vial.
Dose count
- 5 mg vial = 5,000 mcg total.
- 10 mg vial = 10,000 mcg total.
- 20 mg vial = 20,000 mcg total.
- Total doses = total mcg divided by dose mcg.
Duration
If a 10 mg vial is used at 500 mcg per dose, that vial contains 20 doses. Daily use lasts about 20 days. Every-other-day use lasts about 40 days. Weekly use lasts about 20 weeks.
What BAC water changes
Adding more BAC water makes the liquid more diluted and the syringe draw larger. It does not create more peptide. The vial lasts the same number of doses either way.
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.