Peptide Field Book

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Planning tool

Vial planner.

Advanced inventory arithmetic from explicit assumptions.

Start with measurement basics. A modeled schedule is not a recommendation; the initial schedule is an arithmetic example.

Your plan.

Edits are saved automatically in this browser when storage is available: the peptide, schedule, vial sizes, prices and mixing inputs. Anyone using this browser profile can reopen them. Clear the saved plan to delete it. Later edits will be saved again.

Start from a peptide

Choosing one fills in the vial sizes the vendor lists, and offers its published schedules.

Vial sizes to compare

Add up to 6. A price for every size lets the planner compare what they cost.

Schedule

The first dose is on day 0, and each step starts where the one before it ended. The 1 mg a week it starts with is only an example, not a dose for any peptide.

  1. Step 1

Length and mixing

Used because the last step is ongoing.

The initial 28-day assumption comes from CDC guidance for opened multi-dose vials, unless the manufacturer specifies otherwise. It does not validate a mixed research product’s stability, sterility or beyond-use date.

More on storing a mixed vial

Topping up

The same in every size. With it, each step shows its dose in units on a U-100 syringe (100 units = 1 mL).

See what it takes

What it takes.

Results use the schedule and assumptions shown in the form. Loaded source records retain their attribution beside the schedule. Cost comparisons do not determine clinical suitability. Entered discard times are modeling assumptions, not validated stability or sterility limits for a research vial.

The short answer

5 mg vials waste least.

At this dose, a 10 mg vial passes 28 days with 6 mg still in it.

6 vials over 24 weeks 5 mg thrown away (17%)

The plan: 24 weeks, 24 doses, 24 mg in all.

  • 5 mg vials

    Least thrown away

    6 vials needed

    Mixed 6 times, about every 28 days.

    Used
    24 mg
    Thrown away
    5 mg 17%
    Left over at the end
    1 mg

    How long one vial lasts

    • Every dose 1 mg once a week Lasts 28 days, 1 mg thrown away per vial

  • 10 mg vials

    6 vials needed

    Mixed 6 times, about every 28 days.

    Used
    24 mg
    Thrown away
    30 mg 50%
    Left over at the end
    6 mg

    How long one vial lasts

    • Every dose 1 mg once a week Lasts 28 days, 6 mg thrown away per vial

Timeline

One bar for each vial, from the day it is mixed until it is used up or thrown away.

5 mg vials6 vials10 mg vials6 vials024681012141618202224Weeks from the first dose
  • Used
  • Thrown away
  • Left over at the end
Every vial, week by week

5 mg vials 6 vials

  1. Weeks 1–4: 4 mg used, 1 mg thrown away after 28 days.
  2. Weeks 5–8: 4 mg used, 1 mg thrown away after 28 days.
  3. Weeks 9–12: 4 mg used, 1 mg thrown away after 28 days.
  4. Weeks 13–16: 4 mg used, 1 mg thrown away after 28 days.
  5. Weeks 17–20: 4 mg used, 1 mg thrown away after 28 days.
  6. Weeks 21–24: 4 mg used, 1 mg left over at the end.

10 mg vials 6 vials

  1. Weeks 1–4: 4 mg used, 6 mg thrown away after 28 days.
  2. Weeks 5–8: 4 mg used, 6 mg thrown away after 28 days.
  3. Weeks 9–12: 4 mg used, 6 mg thrown away after 28 days.
  4. Weeks 13–16: 4 mg used, 6 mg thrown away after 28 days.
  5. Weeks 17–20: 4 mg used, 6 mg thrown away after 28 days.
  6. Weeks 21–24: 4 mg used, 6 mg left over at the end.

Switch points

5 mg vials waste least at every step.

Judged at each step’s own rate, as if the step went on and on. The totals above are for this plan only, so they can differ.

Step by step
Back to your plan
How the math works

  • Days. The first dose is on day 0. Each step starts on the first day of a week, where the step before it ended. Once a week is day 0 of each week; twice a week, days 0 and 3; three times a week, days 0, 2 and 4; 5 days on, 2 off, days 0 to 4; every day, all seven. Every other day is every second day of the step.

  • A vial is mixed on the day it is first needed. A dose can come from it only within the days you set: with 28, days 0 to 27 are fine (the day it is mixed is day 0), and on day 28 whatever is left is thrown away.

  • Topping up. When a vial holds less than a dose, topping up uses what is left and takes the rest from a new vial. Without it, what is left is thrown away and the whole dose comes from a new vial.

  • Left over at the end is what is still in the last vial when the plan ends. It is not counted as thrown away, since it may be used later. A last vial that has passed its days before the plan ends is thrown away, not left over.

  • Each step is also judged on its own, as if it went on and on: how long a vial lasts at that rate, and what the limit costs. The switch points come from that, so they can differ from the totals, which are for this plan only. A sentence about a step that the plan itself does not reach says “if the plan went on”.

  • Cost per mg used is the total cost divided by the mg in the doses. A vial that is left over is paid for but not used, so it counts in the cost.

  • Dead space. A little solution is lost in the needle and the syringe with every draw. The planner doesn’t model it, so a real vial may run out a little sooner.

  • Units are the dose over the strength of the mixed vial, in hundredths of a milliliter: 100 units = 1 mL on a U-100 syringe.

  • No doses. It only does arithmetic on the numbers you enter, or on a published schedule you choose to load. It never says what dose to take.

This does arithmetic only. It doesn’t tell you what dose to take.