March 6, 2026 
peptidephysician 
26 min read Overview
If you do a cursory online search, you will be inundated with a multitude of opinions discussing how to convert peptide powder into a solution ready for research use. This page explores two main methods to perform research.
Method 1 involves creating a specialized peptide pen, and is the recommended method. It requires a little bit of work. But once you get the hang of it, it becomes much easier to manage because dose calculations are a factor of turning a dial.
Method 2 is easier to set up and preferred for people who don’t want the hassle of making their own pen.
Method 1 (Pen)
The pen method is the recommended method because of its accuracy. It requires an extra step or two compared to the other methods, but with just a little bit of time investment, all confusion is eliminated. In a nutshell, you make your own pen that can deliver a fine tuned dose.
Materials
| Materials needed | Estimated Cost |
|---|---|
| Reusable injection pen | $23 – 50 |
| 3 mL cartridge | $2 per cartridge |
| Two syringes for mixing (23 guage) | < $1 |
| Two alcohol wipes for sanitation | Pennies per wipe |
| Needle tips | Pennies per needle tip |
| Bacteriostatic water (3 mL per pen) | Varies based on brand |
| Peptide vial | Varies depending on peptide |
Step 1: Find a clean working surface
The first step is to find a clean surface. A flat table would work, but ensure that the area is wiped down and clean.
Step 2: Lay out materials
After choosing an appropriate surface, lay out the following materials: peptide vial, bacteriostatic water, 3 mL cartridge, and two 23 gauge syringes for mixing.
Step 3: Prepare the vials and cartridge, and sanitize
Remove the 3 mL cartridge from its packaging, and uncap the bacteriostatic water and peptide vial. Open an alcohol pad, and then with a single swipe sanitize the top of each
Step 4: Pull 2.2 mL of water from the bacteriostatic water container
After ensuring that the 23G needle is tightly fastened on the mixing syringe, pull back 2.2 mL of air and inject the air into the bacteriostatic water vial, then immediately draw back 2.2 mL of bacteriostatic water.
Multi-use bacteriostatic water vials are zero pressure systems, which means if you are going to take contents out, you need to push in an equivalent amount of air to avoid creating a pressure vacuum.
Note: The 2.2 mL value seems arbitrary, however it is selected to ensure that the final volume is at least 2.0 mL, given that there will be up to 10% volume loss. Another benefit is that most research peptide vials are typically overfilled by ~10%, and hence adding an extra 10% volume will give you the most accurate measurements.
Step 5: Inject the 2.2 mL of bacteriostatic water into the peptide vial.
Slowly lower the 23G syringe filled with 2.2 mL of bacteriostatic water into the rubber stopper of the peptide vial. Once the needle is within the vial, there is typically no need to actively push the water as the vials are created to have an intrinsic negative-pressure system, pulling the water out of the syringe and into the vial.
The 23 G mixing syringe will be used again shortly. So make sure to safely recap it and set it aside. Do not discard yet.
Step 6: Gently mix the contents of the vial
Hold the vial between your two hands and gently roll it until all contents are mixed. Do not aggressively shake the vial, because that may result in foaming which may make it harder to remove the contents of the vial. Ensure that the contents are dissolved. A little bit of foam is okay, it will settle within a couple of minutes.
Step 7: Remove the contents of vial with the 23 G syringe
Grab the 23G mixing syringe from earlier and insert the needle into the vial. Now, turn the vial upside down and ensure that the needle is within the vial but ensure that the needle is always at a lower vertical length than the liquid, so you can make sure to remove the entire contents. Firmly pull back on the syringe plunger to remove the entire contents. This step requires a bit of dexterity as you are playing a bit of tug of war with the negative pressure within the system. Once you got as much of the peptide solution out, remove the syringe and recap it, and set it aside as you set up the next step.
Note: A little bit of solution will remain in the vial, but that is okay, our process accounts for up to 10% loss.
Step 8: Setting up the 3 mL cartridge
The 3 mL cartridge is a closed system. Which means that if you inject something in it, you are increasing the pressure within the cartridge. To mitigate this, you need to vent the system. To do this, grab the unused 23G syringe (remember, the materials call for two 23G syringes). Remove the needle off the syringe, and uncap the needle. We actually don’t need the entire syringe, just the needle. Place the needle (again, needle alone, no syringe attached) into the rubber stopper of the 3mL cartridge.
Then, uncap the other 23G syringe that contains the peptide solution pulled from the vial in the last step, uncap the syringe, and place into the rubber stopped of the 3 mL cartridge at a different location than the venting needle. Do not attempt to put it through the venting needle.
Gently push the contents of the syringe into the cartridge. Do not push too quickly, or else foam will develop. Once all of the fluid is pushed into the cartridge, remove the needle and syringe. At this point, safely discard both syringes/needles.
Step 9: Putting the cartridge in the pen
The reusable pens we recommend are the V2 peptide pens, which are found on eBay, Amazon, or on supply websites. The pens have three parts: an injector end, a cartridge department, and a cap.
After removing the cap, screw the pen and place the 3 mL cartridge you made at the last step into the cartridge department. The top of the cartridge should be at the very tip of the pen.
Screw the pen back together.
Step 10: Purge the air from the pen
Once assembled, the cartridge will contain an air pocket that must be removed before use. Attach a new needle tip securely to the pen, then hold the pen upright with the needle pointing upward.
Turn the dosing dial to a small setting and press the injection button to expel air. Repeat this process until all visible air is removed and a small drop of liquid appears at the needle tip. This confirms that the system is fully primed and free of air.
Avoid rushing this step, as incomplete purging may result in inaccurate dosing.
Step 11. Figure out your research dose.
To figure out your research dose, navigate to our dosage calculator.
Step 12: Safely store reconstituted peptides
After reconstitution, your assembled pens should be stored in a refrigerator. Research use beyond 3 months from reconstitution is not recommended.
Method 2 (Syringe)
The syringe method involves mixing the peptides with bacteriostatic water, then drawing up water from the vial, either per use, or upfront, for direct injection. The barrier to entry for this method is less.
Materials
| Materials needed | Estimated Cost |
|---|---|
| Injection syringes (1 mL, 100U) | < $1 per syringe |
| One syringe for mixing (23 guage) | < $1 |
| Alcohol wipes for sanitation | Pennies |
| Bacteriostatic water (3 mL per pen) | Varies based on brand, but < $5 |
| Peptide vial | Varies depending on peptide |
Step 1: Find a clean working surface
The first step is to find a clean surface. A flat table would work, but ensure that the area is wiped down and clean.
Step 2: Lay out materials
After choosing an appropriate surface, lay out the following materials: peptide vial, bacteriostatic water, and one 23 gauge syringes for mixing.
Step 3: Prepare the vials and sanitize
Uncap the bacteriostatic water and peptide vial. Open an alcohol pad, and then with a single swipe, sanitize the top of each.
Step 4: Pull 2.2 mL of water from the bacteriostatic water container
After ensuring that the 23G needle is tightly fastened on the mixing syringe, pull back 2.2 mL of air and inject the air into the bacteriostatic water vial, then immediately draw back 2.2 mL of bacteriostatic water.
Multi-use bacteriostatic water vials are zero pressure systems, which means if you are going to take contents out, you need to push in an equivalent amount of air to avoid creating a pressure vacuum.
Note: The 2.2 mL value seems arbitrary, however it is selected to ensure that the final volume is at least 2.0 mL, given that there will be up to 10% volume loss. Another benefit is that most research peptide vials are typically overfilled by ~10%, and hence adding an extra 10% volume will give you the most accurate measurements.
Step 5: Inject the 2.2 mL of bacteriostatic water into the peptide vial.
Slowly lower the 23G syringe filled with 2.2 mL of bacteriostatic water into the rubber stopper of the peptide vial. Once the needle is within the vial, there is typically no need to actively push the water as the vials are created to have an intrinsic negative-pressure system, pulling the water out of the syringe and into the vial.
Step 6: Gently mix the contents of the vial
Hold the vial between your two hands and gently roll it until all contents are mixed. Do not aggressively shake the vial, because that may result in foaming which may make it harder to remove the contents of the vial. Ensure that the contents are dissolved. A little bit of foam is okay, it will settle within a couple of minutes.
Step 7: Fill the syringes for injection
At this step, you have two options. Your first option is to get all of your doses ready for future use by pre-filling syringes. Your other option is to fill one syringe at a time whenever you are ready for your next dose.
To fill a syringe with peptide solution, uncap the needle and press it into the rubber stopper. Once the needle is within the vial, flip the vial upside down and gently pull back until the desired amount is drawn.
Note: Make sure to wipe the top of the reconstituted peptide vial before inserting a new needle.
Step 8: Figure out your research dose.
Step 9: Safely store reconstituted peptides
Reconstituted peptides, whether in a vial or syringe, should be stored in a refrigerator. Research use beyond 3 months from reconstitution is not recommended.
Overview
If you do a cursory online search, you will be inundated with a multitude of opinions discussing how to convert lyophilized protein powder into a solution ready for research use. This page explores two main methods to perform research.
Method 1 involves creating a specialized peptide pen, and is the recommended method. It requires a little bit of work. But once you get the hang of it, it becomes much easier to manage because dose calculations are a factor of turning a dial.
Method 2 is easier to set up and preferred for people who don’t want the hassle of making their own pen.
Method 1 (Pen)
The pen method is the recommended method because of its accuracy. It requires an extra step or two compared to the other methods, but with just a little bit of time investment, all confusion is eliminated. In a nutshell, you make your own pen that can deliver a fine tuned dose.
Materials
| Materials needed | Estimated Cost |
|---|---|
| Reusable injection pen | $40 |
| 3 mL cartridge | $2 per cartridge |
| Two syringes for mixing (23 guage) | < $1 |
| Two alcohol wipes for sanitation | Pennies per wipe |
| Needle tips | Pennies per needle tip |
| Bacteriostatic water (3 mL per pen) | Varies based on brand, but < $5 |
| Peptide vial | Varies depending on peptide |
Step 1: Find a clean working surface
The first step is to find a clean surface. A flat table would work, but ensure that the area is wiped down and clean.
Step 2: Lay out materials
After choosing an appropriate surface, lay out the following materials: peptide vial, bacteriostatic water, 3 mL cartridge, and two 23 gauge syringes for mixing.
Step 3: Prepare the vials and cartridge, and sanitize
Remove the 3 mL cartridge from its packaging, and uncap the bacteriostatic water and peptide vial. Open an alcohol pad, and then with a single swipe sanitize the top of each
Step 4: Pull 2.2 mL of water from the bacteriostatic water container
After ensuring that the 23G needle is tightly fastened on the mixing syringe, pull back 2.2 mL of air and inject the air into the bacteriostatic water vial, then immediately draw back 2.2 mL of bacteriostatic water.
Multi-use bacteriostatic water vials are zero pressure systems, which means if you are going to take contents out, you need to push in an equivalent amount of air to avoid creating a pressure vacuum.
Note: The 2.2 mL value seems arbitrary, however it is selected to ensure that the final volume is at least 2.0 mL, given that there will be up to 10% volume loss. Another benefit is that most research peptide vials are typically overfilled by ~10%, and hence adding an extra 10% volume will give you the most accurate measurements.
Step 5: Inject the 2.2 mL of bacteriostatic water into the peptide vial.
Slowly lower the 23G syringe filled with 2.2 mL of bacteriostatic water into the rubber stopper of the peptide vial. Once the needle is within the vial, there is typically no need to actively push the water as the vials are created to have an intrinsic negative-pressure system, pulling the water out of the syringe and into the vial.
The 23 G mixing syringe will be used again shortly. So make sure to safely recap it and set it aside. Do not discard yet.
Step 6: Gently mix the contents of the vial
Hold the vial between your two hands and gently roll it until all contents are mixed. Do not aggressively shake the vial, because that may result in foaming which may make it harder to remove the contents of the vial. Ensure that the contents are dissolved. A little bit of foam is okay, it will settle within a couple of minutes.
Step 7: Remove the contents of vial with the 23 G syringe
Grab the 23G mixing syringe from earlier and insert the needle into the vial. Now, turn the vial upside down and ensure that the needle is within the vial but ensure that the needle is always at a lower vertical length than the liquid, so you can make sure to remove the entire contents. Firmly pull back on the syringe plunger to remove the entire contents. This step requires a bit of dexterity as you are playing a bit of tug of war with the negative pressure within the system. Once you got as much of the peptide solution out, remove the syringe and recap it, and set it aside as you set up the next step.
Note: A little bit of solution will remain in the vial, but that is okay, our process accounts for up to 10% loss.
Step 8: Setting up the 3 mL cartridge
The 3 mL cartridge is a closed system. Which means that if you inject something in it, you are increasing the pressure within the cartridge. To mitigate this, you need to vent the system. To do this, grab the unused 23G syringe (remember, the materials call for two 23G syringes). Remove the needle off the syringe, and uncap the needle. We actually don’t need the entire syringe, just the needle. Place the needle (again, needle alone, no syringe attached) into the rubber stopper of the 3mL cartridge.
Then, uncap the other 23G syringe that contains the peptide solution pulled from the vial in the last step, uncap the syringe, and place into the rubber stopped of the 3 mL cartridge at a different location than the venting needle. Do not attempt to put it through the venting needle.
Gently push the contents of the syringe into the cartridge. Do not push too quickly, or else foam will develop. Once all of the fluid is pushed into the cartridge, remove the needle and syringe. At this point, safely discard both syringes/needles.
Step 9: Putting the cartridge in the pen
The reusable pens we recommend are the V2 peptide pens, which are found on eBay, Amazon, or on supply websites. The pens have three parts: an injector end, a cartridge department, and a cap.
After removing the cap, screw the pen and place the 3 mL cartridge you made at the last step into the cartridge department. The top of the cartridge should be at the very tip of the pen.
Screw the pen back together.
Step 10: Purge the air from the pen
After choosing an appropriate surface, lay out the following materials: peptide vial, bacteriostatic water, 3 mL cartridge, and two 23 gauge syringes for mixing.
Step 11. Figure out your research dose.
To figure out your research dose, navigate to the “Dose Calculator (Pen)” tab.
Method 2 (Syringe)
The syringe method involves mixing the peptides with bacteriostatic water, then drawing up water from the vial, either per use, or upfront, for direct injection. The barrier to entry for this method is less.
Materials
| Materials needed | Estimated Cost |
|---|---|
| Injection syringes (1 mL, 100U) | < $1 per syringe |
| One syringe for mixing (23 guage) | < $1 |
| Alcohol wipes for sanitation | Pennies |
| Bacteriostatic water (3 mL per pen) | Varies based on brand, but < $5 |
| Peptide vial | Varies depending on peptide |
Step 1: Find a clean working surface
The first step is to find a clean surface. A flat table would work, but ensure that the area is wiped down and clean.
Step 2: Lay out materials
After choosing an appropriate surface, lay out the following materials: peptide vial, bacteriostatic water, and one 23 gauge syringes for mixing.
Step 3: Prepare the vials and sanitize
Uncap the bacteriostatic water and peptide vial. Open an alcohol pad, and then with a single swipe, sanitize the top of each.
Step 4: Pull 2.2 mL of water from the bacteriostatic water container
After ensuring that the 23G needle is tightly fastened on the mixing syringe, pull back 2.2 mL of air and inject the air into the bacteriostatic water vial, then immediately draw back 2.2 mL of bacteriostatic water.
Multi-use bacteriostatic water vials are zero pressure systems, which means if you are going to take contents out, you need to push in an equivalent amount of air to avoid creating a pressure vacuum.
Note: The 2.2 mL value seems arbitrary, however it is selected to ensure that the final volume is at least 2.0 mL, given that there will be up to 10% volume loss. Another benefit is that most research peptide vials are typically overfilled by ~10%, and hence adding an extra 10% volume will give you the most accurate measurements.
Step 5: Inject the 2.2 mL of bacteriostatic water into the peptide vial.
Slowly lower the 23G syringe filled with 2.2 mL of bacteriostatic water into the rubber stopper of the peptide vial. Once the needle is within the vial, there is typically no need to actively push the water as the vials are created to have an intrinsic negative-pressure system, pulling the water out of the syringe and into the vial.
Step 6: Gently mix the contents of the vial
Hold the vial between your two hands and gently roll it until all contents are mixed. Do not aggressively shake the vial, because that may result in foaming which may make it harder to remove the contents of the vial. Ensure that the contents are dissolved. A little bit of foam is okay, it will settle within a couple of minutes.
Step 7: Fill the syringes for injection
At this step, you have two options. Your first option is to get all of your doses ready for future use by pre-filling syringes. Your other option is to fill one syringe at a time whenever you are ready for your next dose.
To fill a syringe with peptide solution, uncap the needle and press it into the rubber stopper. Once the needle is within the vial, flip the vial upside down and gently pull back until the desired amount is drawn.
Note: Make sure to wipe the top of the reconstituted peptide vial before inserting a new needle.
Step 8: Figure out your research dose.
To figure out your research dose, navigate to the “Dose Calculator (Syringe)” tab.
Step 9: Safely Store Reconstituted Peptides
Reconstituted peptides, whether in a vial or syringe, should be stored in a refrigerator. Research use beyond 3 months from reconstitution is not recommended.