Peptide Reconstitution Calculator: Complete Guide to Preparation

Introduction

Proper peptide reconstitution is critical for research accuracy. This guide provides formulas, reference tables, and practical tips for preparing peptide solutions with precise concentrations.

Key Terms

• Reconstitution: Dissolving lyophilized peptide powder in a sterile solvent
• Bacteriostatic Water (BAC water): Sterile water containing 0.9% benzyl alcohol as an antimicrobial preservative
• Concentration: Amount of peptide per unit volume (typically mcg/mL or mg/mL)
• Lyophilized: Freeze-dried powder form

The Reconstitution Formula

The fundamental formula for calculating reconstitution concentration is:

Concentration = Peptide Mass / Solvent Volume

For example, reconstituting 5mg of peptide in 2mL of BAC water:

• Concentration = 5mg / 2mL = 2.5 mg/mL
• Concentration = 2500 mcg/mL

Quick Reference Table

2mg Vial Reconstitution

BAC Water (mL)	Concentration (mcg/mL)	100mcg = ? units	250mcg = ? units
1.0 mL	2000 mcg/mL	5 units (0.05 mL)	12.5 units (0.125 mL)
2.0 mL	1000 mcg/mL	10 units (0.10 mL)	25 units (0.25 mL)
3.0 mL	667 mcg/mL	15 units (0.15 mL)	37.5 units (0.375 mL)

5mg Vial Reconstitution

BAC Water (mL)	Concentration (mcg/mL)	100mcg = ? units	500mcg = ? units
1.0 mL	5000 mcg/mL	2 units (0.02 mL)	10 units (0.10 mL)
2.0 mL	2500 mcg/mL	4 units (0.04 mL)	20 units (0.20 mL)
3.0 mL	1667 mcg/mL	6 units (0.06 mL)	30 units (0.30 mL)

10mg Vial Reconstitution

BAC Water (mL)	Concentration (mcg/mL)	250mcg = ? units	500mcg = ? units
1.0 mL	10000 mcg/mL	2.5 units	5 units
2.0 mL	5000 mcg/mL	5 units	10 units
3.0 mL	3333 mcg/mL	7.5 units	15 units

Step-by-Step Reconstitution Protocol

Materials Needed

1. Lyophilized peptide vial
2. Bacteriostatic water (0.9% benzyl alcohol)
3. Insulin syringe (1mL, typically with 100-unit markings)
4. Alcohol swabs

Procedure

1. Calculate the required BAC water volume using the tables above
2. Swab the rubber stopper of the peptide vial with an alcohol pad
3. Withdraw the calculated volume of BAC water into the syringe
4. Insert the needle through the rubber stopper at an angle
5. Slowly dispense the BAC water down the side of the vial (do not blast the powder directly)
6. Gently swirl the vial (do not shake vigorously)
7. Wait 2-3 minutes for complete dissolution
8. Store reconstituted peptide at 2-8C (refrigerator)

Important Notes

• Never shake the vial vigorously - this can denature the peptide
• Always dispense liquid slowly down the glass wall
• Use a new syringe for each draw to maintain sterility
• Label the vial with the reconstitution date and concentration

Peptide Stability After Reconstitution

Peptide	Refrigerated (2-8C)	Frozen (-20C)
BPC-157	30 days	90 days
TB-500	30 days	90 days
Semax	30 days	60 days
Selank	30 days	60 days
Ipamorelin	30 days	90 days
CJC-1295	30 days	90 days
GHK-Cu	14 days	60 days

Common Mistakes to Avoid

1. Using the Wrong Solvent

• Always use bacteriostatic water (contains 0.9% benzyl alcohol)
• Do NOT use sterile water (lacks preservative, shorter shelf life)
• Do NOT use saline (can cause precipitation with some peptides)

2. Shaking the Vial

• Shaking denatures peptide bonds and can destroy bioactivity
• Always swirl gently or let dissolve passively

3. Incorrect Concentration Calculations

• Double-check your math using the tables above
• Remember: 1 mg = 1000 mcg
• On a 100-unit insulin syringe: 100 units = 1 mL

Reconstitution Calculator Formula

For custom calculations:

Desired dose (mcg) / Concentration (mcg/mL) = Volume (mL)
Volume (mL) x 100 = Units on insulin syringe

Example:
Peptide: 5mg vial
BAC water added: 2mL
Concentration: 5000 mcg/mL

Desired dose: 250mcg
250 / 5000 = 0.05 mL = 5 units on the syringe

Conclusion

Accurate peptide reconstitution is essential for research reproducibility. By following the formulas and tables in this guide, you can ensure precise concentrations and maintain peptide stability.

All products sold by Kingston Peptides are intended exclusively for in vitro research and analytical purposes.