Peptide Dosage Calculator: BPC-157, TB-500, Semaglutide & More
Calculate exact peptide doses with our comprehensive guide. Includes dosage charts for BPC-157, TB-500, Semaglutide, and reconstitution math explained simply.
Peptide Dosage Calculator Guide
Calculating accurate peptide doses requires understanding concentrations and syringe measurements. This guide provides formulas, charts, and examples for common peptides.
The Master Formula
Volume to Draw (mL) = Desired Dose (mcg) ÷ Concentration (mcg/mL)
Or in simpler terms:
Syringe Units = (Desired Dose ÷ Peptide Amount) × Water Added × 100
Understanding Insulin Syringes
Standard U-100 insulin syringes:
- 1mL syringe = 100 units total
- 0.5mL syringe = 50 units total
- 0.3mL syringe = 30 units total
Key conversion:
- 10 units = 0.1mL
- 1 unit = 0.01mL
Quick Reference Dosage Charts
BPC-157 Dosage Chart
5mg vial reconstituted with 2mL BAC water = 2.5mg/mL (2,500mcg/mL)
| Desired Dose | Volume | Syringe Units |
|---|---|---|
| 100mcg | 0.04mL | 4 units |
| 200mcg | 0.08mL | 8 units |
| 250mcg | 0.10mL | 10 units |
| 300mcg | 0.12mL | 12 units |
| 500mcg | 0.20mL | 20 units |
Research dosing notes:
- Typical research range: 200-500mcg
- Often administered 1-2x daily in studies
- Local vs systemic administration may affect protocols
TB-500 Dosage Chart
5mg vial reconstituted with 2mL BAC water = 2.5mg/mL
| Desired Dose | Volume | Syringe Units |
|---|---|---|
| 1mg | 0.40mL | 40 units |
| 2mg | 0.80mL | 80 units |
| 2.5mg | 1.00mL | 100 units |
| 5mg | 2.00mL | Full vial |
Research dosing notes:
- Loading phase often uses higher amounts
- Maintenance typically lower
- Usually 1-2x weekly in research
Semaglutide Dosage Chart
5mg vial reconstituted with 2.5mL BAC water = 2mg/mL (2,000mcg/mL)
| Desired Dose | Volume | Syringe Units |
|---|---|---|
| 0.25mg (250mcg) | 0.125mL | 12.5 units |
| 0.5mg (500mcg) | 0.25mL | 25 units |
| 1mg | 0.50mL | 50 units |
| 1.7mg | 0.85mL | 85 units |
| 2.4mg | 1.20mL | Need 2 draws |
Retatrutide Dosage Chart
10mg vial reconstituted with 2mL BAC water = 5mg/mL
| Desired Dose | Volume | Syringe Units |
|---|---|---|
| 1mg | 0.20mL | 20 units |
| 2mg | 0.40mL | 40 units |
| 4mg | 0.80mL | 80 units |
| 5mg | 1.00mL | 100 units |
GHK-Cu Dosage Chart
50mg vial reconstituted with 2mL BAC water = 25mg/mL
| Desired Dose | Volume | Syringe Units |
|---|---|---|
| 1mg | 0.04mL | 4 units |
| 2mg | 0.08mL | 8 units |
| 5mg | 0.20mL | 20 units |
| 10mg | 0.40mL | 40 units |
Wolverine Stack (BPC-157 + TB-500)
Common research combination. Prepare each vial separately:
BPC-157 (5mg in 2mL): 250mcg = 10 units TB-500 (5mg in 2mL): 2.5mg = 100 units (or 2mg = 80 units)
Step-by-Step Calculation Examples
Example 1: BPC-157
Given:
- 5mg BPC-157 vial
- Added 2mL bacteriostatic water
- Want 300mcg dose
Calculate:
- Concentration = 5mg ÷ 2mL = 2.5mg/mL = 2,500mcg/mL
- Volume = 300mcg ÷ 2,500mcg/mL = 0.12mL
- Syringe units = 0.12 × 100 = 12 units
Example 2: Semaglutide
Given:
- 5mg semaglutide vial
- Added 2.5mL bacteriostatic water
- Want 0.5mg dose
Calculate:
- Concentration = 5mg ÷ 2.5mL = 2mg/mL
- Volume = 0.5mg ÷ 2mg/mL = 0.25mL
- Syringe units = 0.25 × 100 = 25 units
Example 3: Custom Calculation
Given:
- 10mg peptide vial
- Added 3mL bacteriostatic water
- Want 750mcg dose
Calculate:
- Concentration = 10mg ÷ 3mL = 3.33mg/mL = 3,333mcg/mL
- Volume = 750mcg ÷ 3,333mcg/mL = 0.225mL
- Syringe units = 0.225 × 100 = 22.5 units (round to 22 or 23)
Choosing Your BAC Water Volume
The amount of bacteriostatic water you add affects ease of measurement:
| Approach | Pros | Cons |
|---|---|---|
| Less water (1mL) | Fewer injections, concentrated | Harder to measure small doses |
| More water (2-3mL) | Easy to measure precisely | More volume per dose |
Recommendation: For peptides dosed under 500mcg, use more water for accuracy. For higher doses (mg range), less water is fine.
Reading Your Syringe Correctly
U-100 Insulin Syringe Markings
- Each small line = 1 unit (0.01mL)
- Each large line = 5 units (0.05mL)
- Numbers (10, 20, 30...) = units, not mL
Tips:
- Hold syringe at eye level
- Read at the bottom of the meniscus
- Use appropriate syringe size (don't use 1mL for 5 units)
Common Mistakes
1. Confusing mg and mcg
- 1mg = 1,000mcg
- Always double-check your units
2. Wrong Syringe Type
- Only use U-100 insulin syringes for these calculations
- U-40 syringes require different math
3. Not Accounting for Dead Space
- Some syringes retain ~0.05mL in the needle hub
- For expensive peptides, consider low dead-space syringes
4. Rounding Errors
- With small doses, rounding matters
- If between units, go to the nearest whole number
Dosing Frequency Reference
Different peptides have different research protocols:
| Peptide | Typical Research Frequency |
|---|---|
| BPC-157 | 1-2x daily |
| TB-500 | 2x weekly |
| Semaglutide | 1x weekly |
| Retatrutide | 1x weekly |
| GHK-Cu | Daily to 2x daily |
| CJC-1295/Ipamorelin | 1-2x daily |
Frequently Asked Questions
How many units is 250mcg of BPC-157?
With 5mg in 2mL: 250mcg = 10 units. With 5mg in 1mL: 250mcg = 5 units.
How much BAC water for 10mg retatrutide?
2mL is standard, giving 5mg/mL. This makes 1mg = 20 units, easy to measure.
Can I combine peptides in one syringe?
Research protocols sometimes combine compatible peptides. Draw each separately into the same syringe. Ensure chemical compatibility first.
What if I can't measure exact units?
Round to the nearest whole unit. The difference of 1-2 units is minimal for most research applications.
Summary
- Always know your concentration (peptide amount ÷ water added)
- Use the formula: Volume = Dose ÷ Concentration
- Convert to units: Volume (mL) × 100 = units
- Use appropriate syringe for your dose range
- Double-check units (mg vs mcg) before calculating