How do you reconstitute peptides?

To reconstitute peptides: 1) Draw bacteriostatic water into a syringe, 2) Inject slowly against the vial wall (never directly onto powder), 3) Let the water run down and dissolve the peptide, 4) Gently swirl if needed — never shake. Most peptides use 1-2mL of BAC water per vial.

How to Reconstitute Peptides: Bacteriostatic Water, Ratios, and Step-by-Step

What You Need

Before reconstituting your peptide, gather these essential supplies:

Lyophilized (freeze-dried) peptide vial
Bacteriostatic water (BAC water) — NOT sterile water for multi-use
Alcohol swabs for sterilization
Insulin syringes (29-31 gauge recommended)
Clean, flat work surface

DYK Data: 89% of community members use bacteriostatic water over sterile water for multi-use vials. BAC water contains 0.9% benzyl alcohol which prevents bacterial growth.

Step-by-Step Instructions

Step 1: Wipe the rubber stopper of both the peptide vial and BAC water vial with an alcohol swab. Let dry for 10 seconds.
Step 2: Draw your desired amount of BAC water into an insulin syringe. Most peptides use 1-2mL.
Step 3: Insert the needle into the peptide vial at an angle, aiming for the inner wall — NOT directly at the powder.
Step 4: Slowly depress the plunger, letting the water trickle down the vial wall onto the powder.
Step 5: Remove the needle and let the vial sit. Most peptides dissolve within 1-2 minutes.
Step 6: If needed, gently roll or swirl the vial. NEVER shake — this can damage the peptide structure.

Reconstitution Ratios by Peptide

Different peptides have different common reconstitution ratios based on typical dosing:

Peptide	Vial Size	BAC Water	Concentration	Common Dose
BPC-157	5mg	2mL	2,500mcg/mL	250-500mcg
TB-500	5mg	2mL	2,500mcg/mL	2-5mg/week
Semaglutide	5mg	2mL	2,500mcg/mL	250-1000mcg/week
Tirzepatide	10mg	2mL	5,000mcg/mL	2.5-15mg/week
CJC-1295	2mg	2mL	1,000mcg/mL	100-300mcg
Ipamorelin	5mg	2mL	2,500mcg/mL	200-300mcg

Common Mistakes to Avoid

Spraying water directly onto powder — this can denature the peptide
Shaking the vial — always gently swirl instead
Using sterile water for multi-dose vials — use BAC water to prevent contamination
Not wiping stoppers with alcohol — introduces bacteria
Adding too little water — makes accurate dosing difficult

Storage After Reconstitution

Once reconstituted, peptides must be refrigerated at 36-46°F (2-8°C). Most reconstituted peptides remain stable for 4-6 weeks when stored properly. Never freeze reconstituted peptides.

Frequently Asked Questions

Common questions about how to reconstitute peptides: bacteriostatic water, ratios, and step-by-step

Can I use sterile water instead of bacteriostatic water?

For single-use vials, yes. For multi-dose vials (which most are), use bacteriostatic water. The benzyl alcohol in BAC water prevents bacterial growth over multiple uses.

How do I know if my peptide is fully dissolved?

The solution should be completely clear with no visible particles or cloudiness. If you see chunks or cloudiness after 5 minutes, gently swirl again.

What if I accidentally shook the vial?

Let it sit undisturbed for 30 minutes. If the solution clears and no foam remains, it's likely fine. Excessive shaking can denature proteins, potentially reducing effectiveness.

Can I add more BAC water if I added too little?

Yes, you can add more BAC water to dilute the concentration. Just recalculate your dosing based on the new total volume.

How long does reconstituted peptide last?

When properly stored (refrigerated at 36-46°F), most reconstituted peptides last 4-6 weeks. Some like Semaglutide may last up to 8 weeks. If the solution becomes cloudy or develops particles, discard it.