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guide

Peptide Dosing Calculations

Learn how to calculate peptide concentrations and accurately measure doses using insulin syringes.

7 min readUpdated Dec 2024

Peptide Dosing Calculations

Accurate dosing requires understanding concentrations and syringe measurements. This guide walks through the math and provides practical examples.

Understanding Concentration

When you reconstitute a peptide, you create a solution with a specific concentration. This concentration tells you how much peptide is in each unit of liquid.

The Basic Formula

Concentration = Peptide Amount ÷ Water Volume

Example:

  • 5mg peptide + 2ml bacteriostatic water
  • 5mg = 5000mcg (micrograms)
  • 5000mcg ÷ 2ml = 2500mcg/ml
  • This means each milliliter of solution contains 2500mcg of peptide.

    Common Reconstitution Examples

    PeptideWater AddedConcentration
    5mg1ml5000mcg/ml
    5mg2ml2500mcg/ml
    10mg2ml5000mcg/ml
    10mg2.5ml4000mcg/ml
    3mg1ml3000mcg/ml

    Understanding Insulin Syringes

    Insulin syringes are measured in "units" (IU), not milliliters directly. Understanding this conversion is essential.

    Standard U-100 Insulin Syringe

    The most common syringe is the U-100 (100 units per 1ml):

  • 100 units = 1ml
  • 10 units = 0.1ml
  • 1 unit = 0.01ml
  • Syringe Sizes

    Syringe SizeTotal UnitsBest For
    0.3ml30 unitsVery small doses
    0.5ml50 unitsSmall to medium doses
    1ml100 unitsStandard doses

    Calculating Your Dose

    Step 1: Determine Concentration

    After reconstitution, calculate your concentration:

  • Peptide amount (in mcg) ÷ Water added (in ml) = mcg/ml
  • Step 2: Calculate Volume Needed

    For your desired dose:

  • Desired dose (mcg) ÷ Concentration (mcg/ml) = ml to draw
  • Step 3: Convert to Syringe Units

    Convert ml to units:

  • ml needed × 100 = units to draw (for U-100 syringe)
  • Practical Example

    Scenario: You have a 5mg BPC-157 vial, added 2ml BAC water, and want a 250mcg dose.

    Step 1: Calculate concentration

  • 5mg = 5000mcg
  • 5000mcg ÷ 2ml = 2500mcg/ml
  • Step 2: Calculate volume

  • 250mcg ÷ 2500mcg/ml = 0.1ml
  • Step 3: Convert to units

  • 0.1ml × 100 = 10 units
  • Result: Draw to the 10 unit mark on your insulin syringe.

    Quick Reference Charts

    5mg Peptide Reconstituted with 2ml BAC Water (2500mcg/ml)

    Desired DoseML to DrawUnits (U-100)
    100mcg0.04ml4 units
    250mcg0.10ml10 units
    500mcg0.20ml20 units
    750mcg0.30ml30 units
    1000mcg0.40ml40 units

    10mg Peptide Reconstituted with 2ml BAC Water (5000mcg/ml)

    Desired DoseML to DrawUnits (U-100)
    250mcg0.05ml5 units
    500mcg0.10ml10 units
    1000mcg0.20ml20 units
    1500mcg0.30ml30 units
    2000mcg0.40ml40 units

    Tips for Accurate Dosing

  • Use the right syringe size - Smaller syringes have finer gradations for accuracy
  • Hold syringe at eye level - Read measurements straight on, not at an angle
  • Remove air bubbles - Tap syringe and push air out before measuring
  • Be consistent - Use the same reconstitution ratio each time
  • Double-check math - Verify calculations before drawing
  • Use Our Calculator

    For quick and accurate calculations, use our [Peptide Dosing Calculator](/calculator). Simply enter:

  • Peptide amount (mg)
  • Water added (ml)
  • Desired dose (mcg)
  • The calculator will tell you exactly how many units to draw.

    Common Mistakes

  • Confusing mg and mcg - Remember: 1mg = 1000mcg
  • Wrong syringe type - Always verify you have U-100 syringes
  • Estimating instead of calculating - Always do the math
  • Forgetting to account for water volume - More water = lower concentration
  • Frequently Asked Questions

    How do I calculate peptide concentration?

    Divide the peptide amount (in mcg) by the water volume (in ml). For example, 5mg (5000mcg) in 2ml = 2500mcg/ml concentration.

    What does 10 units on an insulin syringe equal?

    On a standard U-100 insulin syringe, 10 units equals 0.1ml. The entire 100 unit syringe holds 1ml.

    Does adding more water change the peptide potency?

    No, adding more water only changes the concentration, not the total amount of peptide. You'll just need to draw more volume to get the same dose.

    Need Help with Dosing?

    Use our calculator to determine exact amounts for your research.

    Peptide Calculator