RESEARCH USE ONLY · NOT FOR HUMAN CONSUMPTION  ·  Educational reference · Affiliate links disclosed
Updated Reference · 25+ Compounds

Stop guessing
your peptide dose.

A precision reconstitution calculator, vetted dosing library, and unit conversion guide — built for people who don't want to mess this up.

Open Calculator → Browse Library
25+
Peptides
U-100
Syringe Math
100%
Free Tool

// SAMPLE OUTPUT

5mg
Vial size5 mg
BAC water2 mL
Target dose250 mcg
Draw10 units
01 / TOOL

The Calculator

Enter your vial size, the volume of bacteriostatic water you'll add, and your target dose. We'll show you exactly how many units to draw on a U-100 insulin syringe.

// INPUTS

Set up your vial

QUICK PRESET
mg
mL
// OUTPUT

Your draw

Draw on syringe
— units
Volume
— mL
Concentration
— mg/mL
Doses per vial
—
Per-dose mcg
—
0 50 100
U-100 Insulin Syringe Visualization
Enter your numbers above to see exact dosing instructions.
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02 / REFERENCE

Peptide Library

Reference dosing observed in research literature, half-lives, and reconstitution starting points. Click a card to load it into the calculator.

// FOR RESEARCH PURPOSES ONLY The compounds referenced below are research peptides. Information is provided for educational and research use only. These compounds are not approved by the FDA for human use and should not be consumed by humans. Consult a qualified medical professional for any health-related questions.
03 / GUIDE

Conversion Reference

The math behind the calculator. Bookmark this page — it's the cheat sheet you'll come back to every time.

01

U-100 Units → mL

10 units0.10 mL
20 units0.20 mL
25 units0.25 mL
50 units0.50 mL
75 units0.75 mL
100 units1.00 mL
02

mg ↔ mcg

1 mg1,000 mcg
0.5 mg500 mcg
0.25 mg250 mcg
0.1 mg100 mcg
0.05 mg50 mcg
2 mg2,000 mcg
03

Common BAC Volumes

5 mg vial2 mL standard
10 mg vial2–3 mL
15 mg vial3 mL
20 mg vial3–4 mL
50 mg vial2–5 mL
100 mg vial2–4 mL
04

Concentration Quick Math

5 mg / 2 mL2.5 mg/mL
10 mg / 2 mL5.0 mg/mL
10 mg / 1 mL10 mg/mL
15 mg / 3 mL5.0 mg/mL
2 mg / 1 mL2.0 mg/mL
100 mg / 2 mL50 mg/mL
05

Storage Quick Reference

Lyophilized (sealed)Freezer
ReconstitutedRefrigerated
Light exposureAvoid
Reconstituted shelf life~30 days
Sealed vial shelf life12–24 mo
06

Reconstitution Tips

Use bacteriostatic water, not regular saline. Add water down the side of the vial — never directly onto powder. Swirl gently to dissolve; never shake. Once mixed, refrigerate and use within ~30 days.

// FOUNDER
Jeannette, founder of Mrs. Peptide and Roman Vitus LLC
04 / ABOUT

The woman behind Mrs. Peptide

I'm Jeannette — founder of Roman Vitus and the woman behind Mrs. Peptide. I built this site because I got tired of watching people stumble through peptide math in forums, hoping they didn't shave a zero off the wrong number.

My background is in personal training, nutrition coaching, and wellness education, and over the years I've worked with enough clients curious about peptides to know there's a real gap between "I read a thread on Reddit" and "I actually understand what I'm doing."

This is the resource I wish existed when I started: clean math, honest references, no hype, and zero fluff. If it helps one person dose with confidence instead of guesswork, it's done its job.

Jeannette
Founder · Roman Vitus LLC
romanvitusllc.com ↗ @jeannetteglosson ↗

Get the Pocket Reference PDF

The full reconstitution guide, dosing tables, and unit conversion sheet in one downloadable PDF — saved to your phone for when you're at the bench.

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05 / QUESTIONS

Things people ask

What's bacteriostatic water and where do I get it?+
Bacteriostatic water is sterile water with 0.9% benzyl alcohol added to prevent bacterial growth. It's what allows reconstituted peptides to last ~30 days refrigerated. It's available through research suppliers, including Peptide Plugs.
Why U-100 syringes?+
U-100 insulin syringes are calibrated so that 100 units = 1 mL. This makes drawing tiny peptide doses far more precise than a 1 mL syringe with broader graduations. Standard for nearly all peptide work.
Does it matter how much BAC water I use?+
Yes — your concentration changes with the volume. More water = more dilute = more units to draw for the same dose. Consistency matters: pick a volume, stick with it across vials, and your unit numbers stay predictable.
What if I get the math wrong?+
That's exactly why this calculator exists. Plug your numbers in, double-check against the conversion tables below, and never trust mental math when working with mcg-level dosing.
Is this medical advice?+
No. This site is educational and provides reference information for research purposes. It is not medical advice and is not a substitute for a licensed healthcare provider. See full disclaimer below.
Why Peptide Plugs?+
It's the supplier I use and trust for purity, consistency, and reliable shipping. The links on this site are affiliate links — using them supports keeping these tools free. You pay the same price either way.