Peptide Reconstitution & Dose Calculator
Two calculators. Reconstitute a vial, then calculate how many units to draw per dose.
Tell me what you have and what you want
I will pick the BAC water amount that gives the cleanest draw on your syringe, and walk you through the mix and the injection.
Your protocol
Mixing protocol
Injection protocol
Shelf-life countdown
Cost
Storage & shelf life
Your protocol will appear here
Fill in what you have and what you want, then press Tell me what to do. The calculator will pick the cleanest BAC volume for your syringe and produce a step-by-step plan.
I have: a 10 mg retatrutide vial.
I want: a 4 mg weekly dose.
I have: U-100 0.5 mL insulin syringes.
→ Add 1.0 mL BAC water. Draw to 40 units. Two doses per vial.
I want to start a cycle. What vial size should I buy?
Tell me your target dose, how often, and how long the cycle runs. I will recommend a vial size that finishes inside its post-reconstitution stability window, and tell you how many vials to order.
Purchase plan
Why this size
Other vial sizes for this compound
| Vial | Doses | Lasts | Fit |
|---|
Titration schedule
| Weeks | Dose | Compound |
|---|
Cost breakdown
How to execute the cycle
Your purchase plan will appear here
Fill in what dose you want, how often, and for how long. The planner will recommend a vial size where every dose stays inside the stability window — and tell you how many vials to order for the whole cycle.
I want: 4 mg retatrutide weekly for 12 weeks.
→ Buy 4 × 10 mg vials. Each lasts 2.5 weeks at 4 mg. Reconstitute one vial at a time.
I already bought vials. What cycle can I run?
Tell me what is on the shelf. I will tell you how long it lasts at a given dose, whether it covers a cycle, and where the stability window will bite.
Coverage
What this inventory covers
Cost on hand
Common cycle options at this dose
| Cycle length | Doses needed | Coverage | Buy more? |
|---|
Your inventory analysis will appear here
List what is on the shelf, your target dose, and how often. The tool computes how long the stock lasts, whether each mixed vial finishes inside its stability window, and which cycle lengths the inventory covers.
I have: 3 × 10 mg retatrutide vials.
I want: 4 mg weekly.
→ 7.5 weeks of coverage. Each mixed vial lasts 17.5 d — inside the 28 d window.
Inputs
Result
Mixing protocol
Already reconstituted? Calculate draw.
Use this if the vial is already mixed and you just need to know how many units to pull for a given dose.
Draw
Worked example — retatrutide 5 mg vial
A common scenario. Reconstitute a 5 mg retatrutide vial with 2 mL BAC water, then draw a 4 mg weekly dose.
| Step | What | Value |
|---|---|---|
| 1 | Vial size | 5 mg lyophilized |
| 2 | BAC water added | 2.0 mL |
| 3 | Concentration after mix | 2.5 mg / mL |
| 4 | Target dose | 4 mg |
| 5 | Volume to draw | 4 / 2.5 = 1.6 mL |
| 6 | On a U-100 syringe | 1.6 mL × 100 = 160 units — exceeds 1 mL syringe |
| — | Better mix | Use 1.0 mL BAC → 5 mg/mL → 4 mg = 0.8 mL = 80 units on U-100 1 mL |
Lesson: pick the BAC volume so the per-dose draw lands inside one full syringe and on round unit numbers. The Guided tab does this automatically.
Compound reference — stability, dose, sources
Stability windows reflect label data where available and vendor COA precedent otherwise. Vendor COA on the actual batch supersedes these defaults. Lyophilized (unreconstituted) vials store at −20 °C for 24+ months in all cases.
Clinical titration ramps
Source-derived ramps used by the Plan a Cycle tab when "Titrated ramp" is selected. These are clinical-trial / label schedules — not research-protocol prescriptions.
Syringe markings — how to read
| Syringe | Markings | 1 unit equals | Max draw |
|---|---|---|---|
| U-100 insulin · 1.0 mL | 0 to 100 units | 0.01 mL | 1.0 mL (100 units) |
| U-100 insulin · 0.5 mL | 0 to 50 units | 0.01 mL | 0.5 mL (50 units) |
| U-100 insulin · 0.3 mL | 0 to 30 units | 0.01 mL | 0.3 mL (30 units) |
| U-40 insulin · 1.0 mL | 0 to 40 units | 0.025 mL | 1.0 mL (40 units) |
| Tuberculin · 1.0 mL | 0 to 1.0 mL (0.01 mL ticks) | — | 1.0 mL |
U-100 is the universal standard for insulin syringes in North America and Europe. U-40 is uncommon outside veterinary use — confirm the syringe before relying on the unit display.
Formulas
concentration (mg/mL) = vial_mg / bac_mL volume_per_dose (mL) = dose_mg / concentration syringe_units (U-100) = volume_per_dose × 100 syringe_units (U-40) = volume_per_dose × 40 doses_per_vial = vial_mg / dose_mg