Introduction
Research peptides are supplied in a range of vial sizes, each designed for different research scales and applications. Understanding the relationship between vial size, reconstitution volume, and working concentration is essential for efficient peptide research. This guide covers standard vial sizes, optimal reconstitution strategies, and concentration calculations.
Standard Peptide Vial Sizes
| Vial Size | Common Peptides | Typical Research Scale |
|---|---|---|
| 2mg | Semaglutide, Tirzepatide, Retatrutide | Small-scale, high-potency research |
| 5mg | BPC-157, TB-500, CJC-1295, GHK-Cu | Standard research protocols |
| 10mg | Ipamorelin, Semax, KPV, MOTS-C | Extended research or higher-dose protocols |
| 15-30mg | AOD 9604, select peptide blends | High-volume research |
Choosing Reconstitution Volume
The amount of bacteriostatic water you add determines your working concentration. The goal is to balance between:
- Easy-to-calculate concentrations (round numbers simplify dosing)
- Appropriate injection volumes (typically 0.05-0.5 mL per dose)
- Vial longevity (more water = more total volume = more potential doses but faster degradation)
Recommended Reconstitution Volumes
| Vial Size | Recommended BAC Water | Concentration | Notes |
|---|---|---|---|
| 2mg | 1 mL | 2 mg/mL (2,000 mcg/mL) | Standard for GLP-1 agonists |
| 2mg | 0.5 mL | 4 mg/mL | Higher concentration, smaller volumes |
| 5mg | 2 mL | 2.5 mg/mL (2,500 mcg/mL) | Most common standard reconstitution |
| 5mg | 2.5 mL | 2 mg/mL (2,000 mcg/mL) | Easy math — 1 unit = 20 mcg |
| 5mg | 1 mL | 5 mg/mL | Concentrated — small volume doses |
| 10mg | 2 mL | 5 mg/mL | Standard for 10mg vials |
| 10mg | 5 mL | 2 mg/mL | Easy math, larger volume |
Concentration Quick Math
The universal formula: Concentration = Peptide Amount ÷ Water Volume
For insulin syringe conversion: 1 unit = 0.01 mL, so mcg per unit = Concentration (mcg/mL) ÷ 100
Example: 5mg in 2mL = 2,500 mcg/mL ? each unit on an insulin syringe = 25 mcg
Physical Vial Considerations
- Vial capacity: Most peptide vials are 2mL or 3mL glass vials. Do not add more water than the vial can hold
- Dead volume: A small amount of solution (~0.05 mL) will remain in the vial and cannot be drawn out. Account for this in total dose calculations
- Rubber stopper integrity: Each needle puncture creates a small hole. Limit total punctures to 20-25 to maintain sterility
Storage by Vial State
| State | Temperature | Duration |
|---|---|---|
| Lyophilized (unopened) | -20°C (freezer) | 12-24 months |
| Lyophilized (opened) | -20°C | Use promptly |
| Reconstituted | 2-8°C (refrigerator) | 21-30 days |
| Room temperature (reconstituted) | 20-25°C | NOT recommended |
Conclusion
Matching vial size to research needs and choosing appropriate reconstitution volumes are practical skills that directly impact research efficiency and data quality. Use the tables in this guide as quick references when setting up peptide research protocols.
All products are sold strictly for research purposes only. Not for human consumption.
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All products are sold strictly for research purposes only. Not for human consumption.