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Vial supply calculator
Find out how long your vials will last, or how many you need for a planned period. The calculator walks through your schedule day by day and tracks every vial from first use until it is empty or past its shelf life.
Peptide & vial
Your stock
Schedule
Shelf life & remainder
Rule used here: an opened vial is usable from the day of first use through day 29 after it. On day 30 whatever is left is discarded.
If the remainder is not enough for a full dose, it is drawn together with part of a new vial — one injection.
Pauses
Planned breaks, freely combinable. The counters start on the start date and again after every pause.
Otherwise an opened vial keeps ageing during the pause; its shelf life keeps running.
Titration
Change the dose in steps. Each step applies from a set point in time, counted from the start date or from the previous step.
Steps follow the calendar; pauses do not delay them. Repeating steps need a maximum dose.
BAC water & cost
28 days after the first puncture is the usual limit for multi-dose containers. Same rule as for vials: usable through the day before.
Result
In the myPeptides app your schedule, stock and opened vials are tracked automatically, and you get a reminder before a vial expires.
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Track doses, plans and progress on your phone — end-to-end encrypted.
How the calculator works
- It goes through your schedule day by day in the calendar, including changes to daylight saving time. Each injection uses the dose that applies on that day.
- A vial is opened on the day of its first injection. With a shelf life of N days it can be used through day N−1 after opening; on day N whatever remains is discarded. An opened vial keeps ageing during pauses.
- If the remainder is too small for the next dose, it is either drawn together with a new vial or discarded — your choice. Either way it counts as one injection and one syringe.
- A pause “after N days” begins once N days of the cycle have passed. A pause after a number of injections or a total amount begins the day after the injection that reaches the limit; any further injections planned for that day are skipped. After a pause every counter starts again from zero.
- Titration steps follow the calendar from the start date or from the previous step. A maximum dose caps every step.
- The calculator looks at most 3 years ahead and stops at 1000 vials.
Frequently asked questions
Why is part of a vial thrown away?
Once a vial has been mixed and punctured, it should only be used for a limited time. If your weekly dose uses up less than the vial holds within that time, the rest is left over when the time runs out. The calculator shows exactly how much that is for your schedule.
Which shelf life should I enter?
Use the period stated by the manufacturer or your pharmacist. The calculator starts with 30 days because many reconstitution guides use it; you can change the value or switch the limit off. The choice matters more than it seems: with one injection a week, 28 days fit four injections into a vial (days 0, 7, 14, 21), 30 days fit five (day 28 as well) — one injection more or less per vial, and the calculator shows what that does to your supply.
What does “use up the remainder” mean?
When a vial no longer holds a full dose, you can draw the rest and top it up from a new vial in the same syringe. If you switch this off, the calculator throws the rest away and takes the whole dose from the new vial — the numbers then show how much that costs.
How is the reorder date calculated?
It is the date of your last fully covered injection minus the delivery time you enter. If you order by then, the new vials should arrive before you run out.
How much bacteriostatic water do I need?
Every vial you open needs the amount of BAC water you enter. The calculator adds that up and also counts bottles, taking into account that an opened bottle is usually used for no more than 28 days.
How can I waste less?
The calculation shows where the loss comes from. If a vial holds more than you use within its shelf life, a smaller vial size lowers the discarded amount. More BAC water only makes the solution weaker; it does not change how much active ingredient is left. This is a purely mathematical comparison, not a dosing recommendation.
More on shelf life after opening: bacteriostatic water shelf life