Gather everything before you begin so you are not hunting for supplies mid-process. The whole procedure takes under two minutes once you have these ready.
Your peptide vial
The lyophilized powder from Purity Peptides. Inspect the vial on arrival to make sure the powder is present and the seal is intact.
Bacteriostatic water (BAC water)
Sterile water with 0.9% benzyl alcohol. This is not the same as plain water. The benzyl alcohol prevents microbial growth and keeps your reconstituted peptide stable in the fridge for up to 30 days. Do not substitute plain sterile water unless you plan to use the entire vial in one session.
Insulin syringes (28-31 gauge)
The fine gauge and precise graduation marks make insulin syringes ideal for the small volumes involved in peptide reconstitution. 1mL syringes with U-100 markings are standard.
Alcohol wipes
To sterilize the rubber stopper on each vial before every draw. This is a contamination control step, not optional.
A clean, flat workspace
No need for a sterile lab. A clean table or countertop with no draft is fine. Wash your hands first.
New to reconstitution? Jordan at Purity Peptides walks through this process with every new customer. Message @jordanb_pp on Telegram before your first reconstitution and he will answer any questions in real time.
/ The Process
Step by Step
Follow these steps in order. The entire process should take about 90 seconds once you have done it once or twice.
01
Set Up a Clean Workspace
Choose a clean, flat surface away from drafts. Wash your hands with soap and water. Dry completely. Gather all your supplies before starting so nothing gets rushed.
02
Wipe Both Vial Tops with Alcohol
Take a fresh alcohol wipe and swab the rubber stopper on your peptide vial. Then swab the stopper on the BAC water vial. Let both air dry for 5 to 10 seconds. This kills any surface contaminants before the needle touches them.
03
Draw the BAC Water Into the Syringe
Insert the syringe needle through the center of the BAC water vial stopper. Pull the plunger back to draw up the volume of water you need. See the section below to determine how much. Remove the needle from the vial when done.
04
Inject Slowly Down the Side of the Vial
Insert the needle into the peptide vial at an angle so the tip touches the inner glass wall. Depress the plunger slowly and steadily, letting the water trickle down the side of the glass rather than squirting directly onto the powder. Hitting the powder with force can damage the peptide structure.
05
Swirl Gently, Never Shake
Once all the water is in, gently roll the vial between your palms or swirl it in a slow circular motion. Do not shake. Shaking creates bubbles and can physically degrade peptide bonds, reducing potency. Swirling is enough.
06
Let It Dissolve Fully
Most peptides dissolve within 30 to 60 seconds of gentle swirling. The solution should be clear. Some peptides produce a very faint color, which is normal for certain amino acid sequences. If powder remains after two minutes, continue swirling slowly and give it more time before drawing any solution.
07
Label the Vial with Today's Date
Write the reconstitution date on the vial using a label or a strip of tape. This is your 30-day clock. If you cannot remember when you reconstituted it, you cannot safely judge whether it is still good to use.
08
Refrigerate Immediately
Place the sealed vial in your fridge at 35 to 46°F (2 to 8°C). Keep it away from the back wall of the fridge where it might freeze. Keep it away from the door where temperature fluctuates. A dedicated spot on a middle shelf works well.
/ Concentration
How Much Water to Add
The amount of BAC water you add determines the concentration of your final solution. Concentration is expressed in mg/mL (milligrams of peptide per milliliter of liquid).
The most common starting point is 2mL of BAC water for a 5mg vial, giving you a 2.5mg/mL solution. This is a practical concentration that makes dosing math straightforward. You can adjust based on your specific research protocol.
The formula is simple:
Concentration (mg/mL) = Vial size (mg) divided by BAC water added (mL)
Example: 5mg vial + 2mL BAC water = 2.5mg/mL
Quick Calculator
Enter your vial size and how much water you plan to add, and we will show you the resulting concentration.
Vial sizemg
BAC water to addmL
For more detailed dosing calculations, use our full Dosing Calculator, which lets you calculate exact syringe volumes for any dose from any concentration.
/ After Reconstitution
Storage After Reconstitution
Once your peptide is dissolved in BAC water, it requires consistent refrigeration. The rules are simple and non-negotiable for maintaining quality.
35-46
Temperature Range
Degrees Fahrenheit
Standard refrigerator temperature. Do not let the vial freeze after reconstitution.
28-30
Usable Window
Days Refrigerated
After this window, potency can begin to decline. Always label the vial with the reconstitution date.
No
Light Exposure
Keep in Darkness
UV light can degrade sensitive amino acids. Keep the vial in the original box or wrapped in foil.
No
Repeated Freezing
Avoid Freeze-Thaw
Repeated freeze-thaw cycles damage peptide structure. If you need long-term storage, keep remaining powder unreconstituted in the freezer.
Sterility between uses: Every time you draw from the vial, wipe the stopper with a fresh alcohol wipe first. This prevents introducing contaminants that could compromise the remaining solution.
/ Common Questions
Frequently Asked Questions
Most peptides dissolve into a clear, colorless solution. Some cloudiness immediately after injection of the water is normal as the powder begins to dissolve. After swirling gently for 60 seconds, the solution should clear. If it remains persistently cloudy after several minutes of swirling, check whether your specific peptide may require a different solvent, such as dilute acetic acid. When in doubt, message Jordan before using.
Visible particles or floaters after full dissolution can indicate contamination, an undissolved fragment, or peptide aggregation. Do not use a solution with visible particles. Small undissolved fragments can sometimes be addressed with additional gentle swirling and time. Persistent particles may mean the peptide is aggregating due to pH or solvent incompatibility. Contact us on Telegram with a description and we will help troubleshoot.
Freezing a reconstituted peptide is possible but not ideal. Each freeze-thaw cycle risks damaging peptide bonds and reducing effective concentration. If you need to extend storage beyond 30 days, a better approach is to only reconstitute part of the vial and keep the remaining powder dry in the freezer. Dry lyophilized powder is far more stable than frozen liquid.
Any pharmaceutical-grade bacteriostatic water (0.9% benzyl alcohol) works. Brand does not significantly matter as long as it is sourced from a reputable pharmaceutical supplier, is clearly labeled as bacteriostatic water (not plain sterile water or saline), and has not expired. Purity Peptides carries research-grade BAC water alongside our peptides if you need a source you can trust.
Continue gentle swirling and give it more time. Most peptides are fully soluble in BAC water at room temperature with a little patience. If after 5 minutes there is still visible undissolved powder, try placing the vial in your palm and rolling it between both hands for gentle warming. For specific peptides that are known to be difficult to dissolve (such as certain GH peptides), a dilute acetic acid solution may be the appropriate solvent. Check the product documentation or ask us on Telegram.
Use our Dosing Calculator to find the exact syringe volume for your target dose. The formula is: syringe volume (mL) = desired dose (mg) divided by your solution concentration (mg/mL). For example, if you want 0.25mg and your concentration is 2.5mg/mL, you draw 0.10mL, which is 10 units on a U-100 insulin syringe.
Reusing needles is not recommended. Each insertion dulls the needle tip slightly and introduces a contamination risk. Insulin syringes are inexpensive and designed for single use. Using a fresh syringe each time is the safest practice for maintaining solution sterility over the 30-day usable window.
/ Next Step
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