Vial FAQ
Questions about Vial, answered
Vial is a peptide reconstitution calculator and dose tracker for iPhone. It turns your vial strength, bacteriostatic water volume, and target dose into exact syringe units, then tracks every dose with on-device reminders. It supports BPC-157, TB-500, GLP-1s like semaglutide and tirzepatide, TRT, and custom compounds. The calculator is free.
Last updated June 12, 2026
About Vial
What is Vial?
Vial is a peptide reconstitution calculator and dose tracker for iPhone. It converts your vial strength, bacteriostatic water volume, and target dose into exact syringe units, then tracks every dose with on-device reminders. It works for research peptides, compounded GLP-1s, and TRT. The reconstitution calculator is free.
Who is Vial for?
Vial is for anyone running a peptide or hormone protocol who wants accurate dosing and a reliable log. Its two core users are compounded GLP-1 patients on semaglutide, tirzepatide, or retatrutide, and peptide users running compounds like BPC-157, TB-500, and CJC-1295. TRT users track testosterone and HCG.
What devices does Vial run on?
Vial runs on iPhone (iOS). It is not available on Android or as a web app yet. An Android version is on the roadmap but is not scheduled. The app is built for daily use, so most people open it from their phone several times a day.
Is Vial a medical device?
No. Vial is a personal calculation and tracking tool, not a medical device. It does not diagnose, treat, or recommend a dose. The calculator performs arithmetic on the numbers you enter. Always confirm calculations and protocol decisions with a licensed clinician or compounding pharmacist.
The reconstitution calculator
What is peptide reconstitution?
Reconstitution is mixing a freeze-dried (lyophilized) peptide powder with bacteriostatic water to make an injectable solution. The volume of water you add sets the concentration, which determines how many syringe units equal your target dose. Getting this math wrong is a common cause of accidental overdose or underdose.
How does the Vial calculator work?
Enter your vial strength in mg, the bacteriostatic water you added in mL, and your target dose in mcg or mg. Vial returns the concentration, the draw volume in mL, and the exact insulin-syringe units to draw. It supports U-20, U-30, U-40, and U-100 syringes and saves vials for instant recall.
How do I calculate a peptide dose in syringe units?
Concentration equals total peptide divided by water volume. Draw volume equals dose divided by concentration. For example, a 5 mg vial with 1 mL of bacteriostatic water is 5 mg/mL, so a 250 mcg dose is 0.05 mL, which is 5 units on a U-100 syringe. Vial does this automatically.
What syringe types does Vial support?
Vial supports U-20, U-30, U-40, and U-100 insulin syringes. You select your syringe type and the calculator outputs the exact unit mark to draw to on the barrel, so you never convert between mL and units by hand. You can set a default syringe in settings.
What is the Water Solver?
The Water Solver works the calculation backwards. Instead of solving for units, you enter the dose and the syringe units you want it to land on, and Vial tells you how much bacteriostatic water to add to the vial. It is useful when you want a dose to equal a round, easy-to-read number of units.
Does Vial support peptide blends and stacks?
Yes. Vial supports multi-peptide blends such as KLOW and GLOW, plus custom stacks. You enter each component and Vial handles the per-peptide concentration and draw volume so a combined vial still gives you accurate units for each compound.
Peptides and compounds
What peptides does Vial support?
Vial includes 15 presets: BPC-157, TB-500, CJC-1295 with and without DAC, Ipamorelin, GHK-Cu, semaglutide, tirzepatide, retatrutide, Epitalon, NAD+, MOTS-c, Tesamorelin, Sermorelin, and PT-141. Testosterone and HCG are included for TRT. Custom peptide entry covers anything not in the preset list.
Does Vial work for GLP-1s like semaglutide and tirzepatide?
Yes. Vial is built for compounded GLP-1 users. It models semaglutide, tirzepatide, and retatrutide as reconstitutable vials, so you can calculate exact units from a powder vial and bacteriostatic water and track each weekly dose. Brand pens like Wegovy and Zepbound do not need reconstitution.
Can Vial track compounded GLP-1 from a pharmacy?
Yes. Compounded GLP-1 usually ships as a powder vial plus bacteriostatic water, which is exactly what Vial's calculator is designed for. You enter the vial strength and water volume, and Vial gives you the units to draw for your prescribed dose, then tracks the schedule.
Does Vial work for TRT?
Yes. Vial supports testosterone and HCG for TRT protocols. You can track injection schedules, rotate sites, and log bloodwork. Pre-mixed oil esters do not use the reconstitution clock, so Vial applies the manufacturer expiry instead of the fridge rule for those.
Can I track BPC-157 and TB-500?
Yes. BPC-157 and TB-500 are built-in presets, including common stacks. Vial calculates units from your vial and water, schedules doses, and logs them with a single tap. You can also run on and off cycles for cycled peptides.
Tracking and reminders
How does Vial track doses?
You save a protocol once with a schedule, then log each dose with a single tap. Vial uses three-state logging, capturing logged, skipped, and missed doses so your history stays accurate. A calendar timeline shows month, week, year, and cycle views, plus streaks across all active protocols.
Do Vial reminders work offline?
Yes. Every reminder is scheduled locally on your device, so they fire with no backend and no internet. Tapping a dose-due notification pre-fills your log sheet, and you can confirm in under three seconds. Vial AI is the only feature that needs a connection.
Does Vial rotate injection sites?
Yes. Vial suggests your next injection site based on your last three sites, helping you avoid repeating the same spot. Site rotation is logged with each dose so you can see your pattern over time on the body map.
Can I export my data?
Yes. Vial exports a CSV of your dose history for a spreadsheet or your doctor, and a full JSON backup containing every protocol, vial, log, metric, and side-effect entry. Because Vial has no cloud sync, the backup file is how you move data to a new phone.
Vial AI
What is Vial AI?
Vial AI is an educational chat assistant included with every paid tier. It knows your active protocol for context and explains peptide mechanisms, half-lives, technique principles, and published prescribing information. It streams responses from a hosted model, so it needs an internet connection.
Can Vial AI give medical or dosing advice?
No. Vial AI is educational only. It cannot diagnose, prescribe, or recommend a specific dose, dose change, or timing. It is configured to refuse personalized clinical questions and redirect you to your prescriber. Always confirm any decision with a licensed clinician.
Privacy and data
Is my Vial data private?
Yes. All protocol data, dose logs, body metrics, bloodwork, and photos are stored on your device in on-device SQLite. Nothing is uploaded to a Vial server, no account is required, and Vial does not track you across other apps or websites.
Does Vial require an account?
No. Vial has no sign-up and no login. You open the app and start using it. Because there is no account and no cloud, your data lives only on your device, which is why exporting a backup before switching phones matters.
What does Vial do with Apple Health data?
With your permission, Vial reads metrics like weight and resting heart rate to show trends, and writes back weight, mood, and side effects so your Health app stays current. All of this happens on your device and is never uploaded to Vial's servers. You can revoke access any time.
Pricing and purchases
Is Vial free?
The reconstitution calculator is free forever with no purchase required. The free tier also includes one saved vial, one active protocol, and 30 days of history. Premium unlocks unlimited protocols, full history, body metrics, bloodwork, progress photos, and Vial AI.
How much does Vial cost?
Vial Monthly is $14.99 and Vial Yearly is $49.99, with a $29.99 first-year intro for new subscribers. Vial Lifetime is $99.99 one time. The AI coach is included with every paid tier, and the reconstitution calculator stays free forever.
What is the refund policy?
All purchases are processed by Apple through the App Store, so refunds follow Apple's refund policy. Request a refund directly from Apple at reportaproblem.apple.com. Vial cannot issue refunds because Apple controls the transaction.
How do I restore a purchase on a new phone?
Open Vial, go to Settings, and tap Restore Purchases, or use the Restore button on the paywall. As long as you are signed into the same Apple ID that made the purchase, your access reactivates. Vial Lifetime also supports Family Sharing.
Comparisons
What is the best peptide tracker app?
A peptide tracker should handle three things: reconstitution math, any peptide rather than one drug, and reliable dose logging. Vial combines a free reconstitution calculator, a three-state tracker for any compound, on-device reminders, and an educational AI coach in one iPhone app. The right choice depends on whether you need calculation plus tracking in one place.
How is Vial different from a GLP-1-only tracker?
Most GLP-1 trackers cover one drug and skip reconstitution math. Vial handles compounded GLP-1s and research peptides and TRT in the same app, and its calculator turns a powder vial into exact syringe units. If you run more than semaglutide, or you reconstitute your own vials, that breadth is the difference.
Is there a free peptide reconstitution calculator?
Yes. Vial's reconstitution calculator is free forever on iPhone with no account. It supports U-20 to U-100 syringes, 15 peptide presets, custom compounds, and a Water Solver that calculates the bacteriostatic water volume backwards from your target units.
Ready to try Vial?
The reconstitution calculator is free. Download Vial on iPhone.
Download on the App Store