A Complete Beginner’s Guide To Reconstituting Peptides
Introduction:
When you purchase Eternal Research Labs, they will arrive in lyophilized form, which is essentially a fancy way of saying freeze dried. This is the industry standard when it comes to peptides in vials.
The reason they come this way and not reconstituted (another fancy word for dissolved in bacteriostatic water) is because they are more stable this way. Once a peptide is reconstituted, its shelf life is 30 to 45 days (in the fridge).
In lypholized form, peptides can be stored for up to 2 years (in the fridge) or frozen for up 3 years. It is not recommended to store peptides at room temperature for more than a week. Further, do not leave your peptides out in heat or sunlight.
Don’t worry, reconstituting peptides is quite easy and we’ll walk you through the simple process in this guide! We’ll also teach you how much to inject based on the amount of bacteriostatic water used.
If you’re looking for a reconstitution/injection calculator, click here.
What You’ll Need:
Checklist:
Your peptide vial (Lypholized)
Alcohol swabs
Bacteriostatic Sterile Water
3ml syringes (Luer Locker Tip)
25G or 27G needles (Luer Lock) – other gauges (G) may also be acceptable
Sharps container (Optional)
Let’s Get Started:
Step 1: Remove caps on both your peptide vial and your bacteriostatic sterile water vial.
Step 2: Wipe down the peptide vial rubber stopper and bacteriostatic water vial rubber stoppers with alcohol swabs and let them dry for 3 minutes.
Step 3: Take your 3ml syringe and needle. Twist in the needle plastic end into the Luer Locker Tip to secure it.
Step 4: Draw your desired volume of bacteriostatic water by pushing back on the plunger. You can overfill and push back in the excess water until you reach the desired marker on the syringe.
NOTE: Small peptide vials hold 3ml max. For these vials, we recommend 2ml of BAC water, although other amounts, between 1ml and 3ml, are acceptable.
NOTE: For larger vials, you can inject up to a max of 5ml. A higher amount of BAC water makes microdosing easier; however, keep in mind that insulin needles tend to max out at 1ml per single injection.
This means that large amounts of BAC water may force you to take more than one injection to reach the desired concentration (depending on the peptide and the desired dose), so, unless you’re microdosing, a good rule of thumb is to stick to 2ml of BAC water per peptide vial.
Towards the end of this guide, you’ll learn some simple math to determine how to measure out the concentration dose on your insulin needle before injection.
Step 5: Now that you have the BAC water in your syringe, insert it into the peptide vial at a slight angle to avoid pressure buildup.
NOTE: Use a higher gauge needle, 25G or higher, to avoid damaging the rubber stopper on the peptide vial. When it comes to needles, a higher gauge means a thinner needle.
Step 6: Let the water gently run down the side of the vial, do not inject forcefully.
NOTE: Sometimes you’ll find the plunger on your syringe will push in on its own as soon as the needle enters the vial. To avoid this, simply hold back the plunger when reconstituting so you have full control of the speed at which the BAC water enters the peptide vial.
Step 7: Avoid shaking. Gently swirl, flip, and roll the vial to dissolve the powder.
NOTE: This process can take 2 to 5 minutes of consistent swirling, mixing (in circular motion) and flipping (up and down). The key here is to do so without shaking or being overly aggressive. Be patient with this part as the water has to run through the powder many times to fully dissolve.
Step 8: Check for full dissolution. The solution should be clear with no visible particles. If it’s cloudy or clumpy, wait a minute and repeat step 7.
Step 9: Once done, cap your needle and dispose (ideally in a sharps container).
Now that your peptide vial is reconstituted make sure you store in the fridge at all times when not using it. The reconstituted peptide will be good for approximately 30 days.
FAQ: Reconstituting Peptides
What is peptide reconstitution?
Reconstitution is the process of mixing lyophilized (freeze-dried) peptides with a sterile liquid, typically bacteriostatic water, to prepare them for administration.
Why use bacteriostatic water instead of just sterile water?
Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits bacterial growth. Sterile water lacks preservatives and must be used immediately after mixing. Sterile water is an option assuming you’re using up the whole vial within 24 hours.
Can I freeze reconstituted peptides?
No. Freezing can damage the peptide structure. Store in the refrigerator (2–8°C) and use within 30 days. Lypholized peptides can be stored in the fridge or freezer (long term), but avoid repeatedly thawing and refreezing.
Can I use sodium chloride (saline) instead of bacteriostatic water?
Yes, but it’s not ideal. Saline lacks preservatives and may affect peptide stability or pH. Bacteriostatic water is preferred for multi-dose use and longer shelf life.
What’s the difference between IU and mg when dosing peptides?
IU (International Units) are used for hormones like HGH or insulin and mg (milligrams) are used for most other peptides.
What if I accidentally shake the bottle?
Don’t panic. Shaking may denature fragile peptides, but one accidental shake isn’t always catastrophic. Let the vial settle, inspect for clarity, and discard if cloudy or clumpy.
Can I pre-load syringes for the week?
Not recommended. Pre-loading increases contamination risk and may degrade peptide potency.
What if my peptide doesn’t fully dissolve?
Try warming the vial gently in your palm. Swirl again (never shake) and take a good 2 to 3 minutes mixing and moving the BAC water (that’s inside your peptide vial) from top to bottom. If particles persist (extremely rare), contact us.
How Do I Know How Much To Inject And How Do I Calculate It?
Here is the basic formula and some examples
Bacteriostatic Water (ml) ÷ Total Peptide Amount (mg) = The amount of ml you need to draw to get 1mg of peptide
Once you have this number you can multiply or divide the ml number to get any desired mg.
For example, let’s imagine you reconstituted a 5mg vial with 2ml of bacteriostatic water and you want to inject 1mg of your peptide.
You would simply take the amount of BAC water you used to reconstitute your peptide vial, which in this case is 2ml, and divide that by 5mg (this is the total amount of peptide for this example).
2ml (BAC water) DIVIDED BY 5mg (total peptide amount in the peptide vial) = 0.4ml
0.4ml on a 1ml insulin syringe will now represent 1mg of the peptide
In other words, 0.4ml of reconstituted peptide drawn out of the peptide vial will contain 1mg of the peptide product.
Based on the example above, If you want to inject 2mg, instead of 1mg, you simply multiply 0.4ml by 2 to get 0.8ml.
Why 0.4ml x 2? Because we just figured out that 0.4ml = 1mg, so multiplying 0.4 by 2 gives us double the mg, in this case, 2mg.
But what if you want to inject 0.5mg? You would simply go the other way and divide 0.4ml by 2 to get 0.2ml.
We already know 0.4ml is 1mg, so 0.2ml is half of that which equals 0.5mg of the peptide.
So now let’s do this example for a 10mg peptide vial. And let’s say this time you used 2.5ml of BAC water.
2.5(ml) % 10(mg) = 0.25(ml)
In this case, 0.25ml of liquid would equal 1mg of the peptide.
Ok, but what if you want to inject 2.5mg and not 1mg.
Based on the above, you would take 0.25ml and multiple it by 2.5 (the desired mg in this case). This would equal to 0.625ml, which means you would draw this much into your insulin needle to inject 2.5mg.
But why 0.25ml x 2.5?? Because we know 0.25ml is 1mg of peptide and we want 2.5mg of peptide, so we need to multiply 0.25ml by 2.5 to figure out how much solution we need to draw out of the peptide vial.
Your insulin needle will have markers that provide you with a way to measure by increments.
We recommend using a 1ml insulin needle as it can contain larger amounts of reconstituted peptide compared to other insulin needles.
Other common insulin syringes come in 0.3ml and 0.5ml variants, but these may force you to use multiple syringes depending on how much reconstituted peptide you need to inject.
