Reconstitution

Why Peptides Need Reconstitution

Most research peptides are supplied as lyophilized (freeze-dried) powder:

Form	Stability	Ready to Use
Lyophilized powder	Months to years	No - needs reconstitution
Reconstituted solution	Days to weeks	Yes - but limited stability

Lyophilization removes water, greatly extending shelf life.

Common Diluents

Bacteriostatic Water (BAC Water)

• Contains 0.9% benzyl alcohol preservative
• Allows multiple use from same vial
• Extends reconstituted stability
• Most common for research peptides

Sterile Water

• No preservatives
• Single use only
• Shorter reconstituted stability
• Used when preservatives contraindicated

Sodium Chloride 0.9% (Saline)

• Isotonic solution
• May be specified for certain peptides
• Can be bacteriostatic or preservative-free

Reconstitution Process

Step-by-Step Guide

1. Gather materials

   • Peptide vial (lyophilized)
   • Diluent (bacteriostatic water)
   • Alcohol swabs
   • Syringe with needle

2. Clean vial tops

   • Wipe both vials with alcohol
   • Allow to dry completely

3. Draw diluent

   • Draw desired amount of BAC water
   • Common volumes: 1mL, 2mL, or as calculated

4. Add to peptide vial

   • Insert needle through stopper
   • Inject slowly along vial wall
   • Do NOT inject directly onto powder

5. Allow to dissolve

   • Let sit or gently swirl
   • NEVER shake vigorously
   • Wait until completely clear

6. Store properly

   • Refrigerate reconstituted peptide
   • Protect from light
   • Use within stability window

Calculating Concentration

After reconstitution, concentration depends on:

• Amount of peptide (mg)
• Amount of diluent (mL)

Example:

• 5mg peptide + 2mL BAC water = 2.5mg/mL
• Each 0.1mL contains 250mcg

Common Reconstitution Volumes

Peptide Amount	Diluent Added	Concentration
5mg	1mL	5mg/mL (5000mcg/mL)
5mg	2mL	2.5mg/mL (2500mcg/mL)
10mg	2mL	5mg/mL (5000mcg/mL)

Choose volume based on desired concentration and typical dose volume.

Storage After Reconstitution

Diluent	Storage	Typical Stability
Bacteriostatic water	Refrigerated	3-4 weeks
Sterile water	Refrigerated	48-72 hours

Stability varies by specific peptide. When in doubt, use shorter timeframes.

Common Mistakes to Avoid

Mistake	Problem	Solution
Shaking vial	Denatures peptide	Gentle swirl only
Direct stream on powder	Can damage peptide	Aim at vial wall
Room temperature storage	Rapid degradation	Always refrigerate
Using tap water	Contamination	Only sterile diluents
Freezing reconstituted	Can damage structure	Refrigerate, don’t freeze

Frequently Asked Questions

How do I know how much diluent to add?

This depends on the peptide amount and your desired concentration. There’s no universal “correct” amount. Choose a volume that gives convenient dosing volumes (e.g., 0.1mL or 0.2mL per dose).

Can I reconstitute with sterile water if I only have bacteriostatic?

Bacteriostatic water works for most situations and is actually preferred for multi-use. Sterile water is typically only necessary when the preservative (benzyl alcohol) is contraindicated.

The peptide didn’t dissolve completely—what should I do?

Wait longer (some peptides take 10-15 minutes), and gently swirl. If particles remain after extended time, there may be an issue with the peptide or diluent. Do not use solutions that remain cloudy or contain particles.