How to Reconstitute Peptides
How to Reconstitute Peptides
A step-by-step guide for every product in our catalog — including BAC water ratios, dosing math, and storage best practices for Costa Rica's tropical climate.
Reconstitution is the process of turning a freeze-dried peptide powder into a liquid solution by adding bacteriostatic water (BAC water). It is one of the most important steps in peptide handling because everything that follows — accurate dosing, peptide stability, and product safety — depends on doing it correctly.
This guide walks you through the entire process step by step, then gives you specific reconstitution recommendations for every product we carry. By the end of it, you should be able to reconstitute any peptide from our catalog confidently.
What You'll Need Before You Start
Before you open any vials, gather everything in one place. Trying to find missing supplies mid-process is how mistakes happen.
- Your lyophilized peptide vial (the freeze-dried powder from us)
- A vial of bacteriostatic water — 2 ml, 3 ml, or 10 ml depending on how many peptides you are reconstituting
- Alcohol swabs (70 percent isopropyl alcohol prep pads)
- A mixing syringe (3 ml or 5 ml with a larger 18-21 gauge needle is easiest for drawing water)
- Insulin syringes for dosing later (1 ml U-100 with a 29-31 gauge short needle)
- A clean, flat work surface with good lighting
- A sharps container for safe disposal of used needles
A note on bacteriostatic water vs. sterile water
Bacteriostatic water contains 0.9 percent benzyl alcohol, a mild preservative that prevents bacteria from multiplying inside the vial. This is what allows a reconstituted peptide to be used safely over a period of weeks. Plain sterile water has no preservative and should only be used if you plan to inject the entire vial in one session. For almost every peptide we sell, BAC water is the correct choice.
The Reconstitution Process: Step by Step
These steps apply to every peptide in our catalog. The only thing that changes between products is the amount of BAC water you add, which we cover in the product-specific section further down.
Let Both Vials Reach Room Temperature
If your peptide vial has been refrigerated, take it out and let it sit on the counter for 15 to 20 minutes before opening. Mixing cold powder with room-temperature water can cause cloudiness and slows down dissolution. Allowing the vial to equalize prevents this and makes the process smoother.
Clean Your Workspace and Wash Your Hands
Wash your hands thoroughly with soap and water for at least 20 seconds. Wipe down the surface you will be working on. Contamination is the single biggest risk in this entire process, so this step is not optional.
Remove the Plastic Caps
Flip off the plastic protective cap from the top of both the peptide vial and the BAC water vial. The rubber stopper underneath is what the needle will pass through. Do not remove the rubber stopper itself.
Sanitize Both Rubber Stoppers
Using a fresh alcohol swab, wipe the rubber stopper on the BAC water vial. Use a separate alcohol swab for the peptide vial. Let both air dry for 10 to 15 seconds. Do not blow on them — that defeats the purpose.
Draw Air Into the Mixing Syringe
Take your mixing syringe and pull back the plunger to draw in an amount of air equal to the amount of BAC water you plan to use. For example, if you are adding 2 ml of BAC water, draw 2 ml of air into the syringe.
Inject the Air Into the BAC Water Vial
Insert the needle into the BAC water vial through the rubber stopper. Push the plunger down to inject the air. This equalizes pressure inside the vial and makes drawing water out much easier.
Draw Your BAC Water
With the needle still in the vial, turn the vial upside down and pull back the plunger slowly to draw your target volume of water. If you pull too much, push the excess back in. Take your time and make sure the volume is exactly what you need.
Inject the Water Into the Peptide Vial — Slowly
This is the most important step of the entire process.
Insert the needle into the peptide vial at a slight angle. Aim the tip of the needle at the inside wall of the glass — not directly at the powder. Push the plunger down slowly so the water trickles down the side of the vial and pools at the bottom.
Why this matters: peptides are delicate molecules. Spraying water directly onto the lyophilized powder can physically damage the peptide structure and reduce potency. Letting the water gently flow down the glass keeps the peptide intact.
Let the Pressure Equalize
Before pulling the needle out, lift it slightly so the tip is above the liquid level but still inside the rubber stopper. Release the plunger and let the internal pressure of the vial equalize naturally. This makes drawing doses later much easier.
Swirl Gently — Do Not Shake
Hold the vial between your fingers and gently swirl or roll it in a circular motion. The powder should dissolve within a minute or two. If it is not dissolving completely, warm the vial briefly between your palms and continue swirling.
âš Never shake a peptide vial
Shaking creates mechanical stress that can denature peptides — meaning it physically unfolds the peptide structure and destroys its function. The foam you see when shaking is actually a sign of peptide damage. Always swirl gently. This is one of the most common mistakes new users make, and it is completely avoidable.
Inspect the Solution
Once dissolved, the solution should be clear and colorless. If you see cloudiness, particles floating in the liquid, or any unusual color, do not use it. Contact us — that is not normal and we will help you figure out what happened.
Label and Refrigerate
Write the reconstitution date on the vial with a permanent marker or a small label. This helps you track the usable life of the solution. Then place the vial upright in your refrigerator at 2 to 8 degrees Celsius, away from the door (which fluctuates more in temperature) and away from light.
Reconstitution Recommendations for Every Product We Carry
Below is a recommended amount of BAC water for each product in our catalog. These amounts are practical defaults that give convenient concentrations for most research dosing protocols. You can use more or less water depending on your specific needs — adding more water just means a more diluted solution with larger injection volumes.
We organize these by category so it is easy to find your product.
Healing and Recovery Peptides
| Product | Add BAC Water | Final Concentration | Each Unit = |
|---|---|---|---|
| BPC-157 10 mg | 2 ml | 5 mg/ml (5,000 mcg/ml) | 50 mcg per unit |
| BPC-157 + TB-500 20 mg | 2 ml | 10 mg/ml (10,000 mcg/ml) | 100 mcg per unit |
| TB-4 10 mg | 2 ml | 5 mg/ml (5,000 mcg/ml) | 50 mcg per unit |
| Thymalin 10 mg | 2 ml | 5 mg/ml (5,000 mcg/ml) | 50 mcg per unit |
These peptides are typically administered subcutaneously. BPC-157 and the BPC+TB blend dissolve easily and produce a clear, colorless solution. TB-4 (Thymosin Beta-4) and Thymalin behave similarly.
Metabolic and Weight Loss Peptides
| Product | Add BAC Water | Final Concentration | Each Unit = |
|---|---|---|---|
| Retatrutide 10 mg | 2 ml | 5 mg/ml | 0.05 mg per unit |
| Retatrutide 12 mg | 2 ml | 6 mg/ml | 0.06 mg per unit |
| Retatrutide 15 mg | 2 ml | 7.5 mg/ml | 0.075 mg per unit |
| Retatrutide 20 mg | 2 ml | 10 mg/ml | 0.1 mg per unit |
| Retatrutide 24 mg | 3 ml | 8 mg/ml | 0.08 mg per unit |
| Retatrutide 30 mg | 3 ml | 10 mg/ml | 0.1 mg per unit |
| Retatrutide 40 mg | 4 ml | 10 mg/ml | 0.1 mg per unit |
| 5-Amino-1MQ 5 mg | 2 ml | 2.5 mg/ml | 25 mcg per unit |
| MOTS-C 40 mg | 2 ml | 20 mg/ml | 0.2 mg per unit |
For Retatrutide, the 10 mg/ml concentration is the most commonly used target because it makes dose math simple. Many researchers keep all Retatrutide vials at this concentration regardless of vial strength, adjusting water volume accordingly.
Growth Hormone Support Peptides
| Product | Add BAC Water | Final Concentration | Each Unit = |
|---|---|---|---|
| CJC with DAC 5 mg | 2 ml | 2.5 mg/ml (2,500 mcg/ml) | 25 mcg per unit |
| Sermorelin 10 mg | 2 ml | 5 mg/ml (5,000 mcg/ml) | 50 mcg per unit |
| Tesamorelin 10 mg | 2 ml | 5 mg/ml (5,000 mcg/ml) | 50 mcg per unit |
| Adamax 5 mg | 2 ml | 2.5 mg/ml (2,500 mcg/ml) | 25 mcg per unit |
CJC-1295 with DAC has a much longer half-life than CJC-1295 without DAC, so weekly dosing protocols are common. Sermorelin and Tesamorelin are typically used more frequently. Allow these peptides extra dissolution time if needed — they sometimes take a minute or two longer to fully dissolve than other compounds.
Longevity and Cellular Health Peptides
| Product | Add BAC Water | Final Concentration | Each Unit = |
|---|---|---|---|
| NAD 500 mg | 3 ml (see note below) | ~166 mg/ml | ~1.66 mg per unit |
| SS-31 10 mg | 2 ml | 5 mg/ml (5,000 mcg/ml) | 50 mcg per unit |
⚠Important — NAD+ has special handling considerations
NAD+ is naturally acidic, which can cause more injection site discomfort than other peptides. Many users report better tolerance when NAD+ is reconstituted with a slightly larger volume of BAC water (3 ml for a 500 mg vial gives roughly 166 mg/ml, which keeps per-injection volumes manageable). Inspect the solution carefully after mixing — it should be clear. If you notice discoloration or precipitate, do not use it. NAD+ is also typically used within a shorter window than other peptides (around 14 days refrigerated) rather than the standard 28 days.
Cognitive and Sleep Peptides
| Product | Add BAC Water | Final Concentration | Each Unit = |
|---|---|---|---|
| Selank 10 mg | 2 ml | 5 mg/ml (5,000 mcg/ml) | 50 mcg per unit |
| DSIP 15 mg | 3 ml | 5 mg/ml (5,000 mcg/ml) | 50 mcg per unit |
Specialty Peptides and Blends
| Product | Add BAC Water | Final Concentration | Each Unit = |
|---|---|---|---|
| PT-141 10 mg | 2 ml | 5 mg/ml (5,000 mcg/ml) | 50 mcg per unit |
| Super Human Blend 10 ml | Pre-mixed — no reconstitution needed | See product label | See product label |
The Super Human Blend arrives pre-formulated in a 10 ml multi-component solution, so no reconstitution is required. The product label includes specific concentration and dosing information.
Understanding the Dosing Math
Once your peptide is reconstituted, you need to know how to convert the concentration into accurate doses on your insulin syringe. The math is simpler than it looks.
The Two Numbers That Matter
Every reconstituted peptide solution has a concentration, expressed in mg per ml or mcg per ml. Your insulin syringe is marked in units. On a standard U-100 insulin syringe, 100 units equals 1 ml. That means 10 units equals 0.1 ml, and 1 unit equals 0.01 ml.
The Core Formula
Or if you prefer working with the simpler version: divide your desired dose by the concentration to get ml, then multiply by 100 to convert to units on your insulin syringe.
Worked Example 1 — BPC-157
You have reconstituted a BPC-157 10 mg vial with 2 ml of BAC water. Your concentration is 5 mg/ml, or 5,000 mcg/ml. You want to dose 250 mcg.
Volume needed = 250 mcg ÷ 5,000 mcg/ml = 0.05 ml
Units on syringe = 0.05 ml × 100 = 5 units
So you would draw 5 units on your insulin syringe to deliver 250 mcg of BPC-157.
Worked Example 2 — Retatrutide
You have reconstituted a Retatrutide 20 mg vial with 2 ml of BAC water. Your concentration is 10 mg/ml. You want to dose 4 mg.
Volume needed = 4 mg ÷ 10 mg/ml = 0.4 ml
Units on syringe = 0.4 ml × 100 = 40 units
So you would draw 40 units to deliver a 4 mg dose.
Worked Example 3 — NAD+
You have reconstituted a NAD 500 mg vial with 3 ml of BAC water. Your concentration is roughly 166 mg/ml. You want to dose 50 mg.
Volume needed = 50 mg ÷ 166 mg/ml = 0.3 ml
Units on syringe = 0.3 ml × 100 = 30 units
So you would draw 30 units to deliver 50 mg of NAD+.
Storage After Reconstitution
Once your peptide is in liquid form, it becomes much more sensitive to temperature, light, and time. Follow these storage rules to protect your investment.
- Refrigerate at 2 to 8 degrees Celsius. Use the back of the fridge, not the door.
- Keep the vial upright and away from light. Original packaging or an opaque container works well.
- Do not freeze. Freeze-thaw cycles damage peptide structure.
- Most reconstituted peptides remain stable for around 28 days when stored properly. NAD+ is the exception with a shorter window of around 14 days.
- Inspect before every use. Cloudiness, particles, color change, or unusual smell are all reasons to discard the vial.
A Costa Rica climate note
In our tropical climate, refrigeration discipline matters more than in cooler countries. Power outages, fridge door openings, and warm kitchens all create temperature fluctuations that shorten peptide life. Keep a small thermometer in your fridge to monitor it, and consider investing in an insulated cooler with cold packs if you travel between the Central Valley and the coast.
Common Mistakes to Avoid
Shaking the vial
We said it earlier but it bears repeating because it is the single most common mistake. Shaking creates foam, foam means denatured peptide, denatured peptide does not work. Always swirl.
Spraying water directly onto the powder
Aim the needle at the inside glass wall, not at the powder. The water should run down the side gently.
Using the wrong water
Tap water, distilled water, saline solutions intended for other purposes — none of these are appropriate. Use bacteriostatic water for multi-use protocols or sterile water for injection if you plan to use the entire vial in one session.
Reusing syringes
Every time a syringe is used, it loses sterility. Always use a fresh syringe for each draw to prevent contamination.
Skipping the alcohol swab
Sanitizing both rubber stoppers every single time is non-negotiable. It only takes a few seconds and prevents the contamination that ruins otherwise good vials.
Forgetting to label the vial
Two weeks from now, you will not remember when you reconstituted a vial. Label it with the date. This small habit prevents the bigger mistake of using a vial past its usable window.
Letting the vial sit at room temperature
Once reconstituted, the peptide goes straight into the fridge. Leaving it on the counter for hours while you do something else is one of the easier ways to shorten its life.
Quick Answers to Common Questions
Can I add more or less BAC water than recommended?
Yes. The amount of water does not damage the peptide — it just changes the concentration and therefore the volume you need to draw for each dose. More water means a more diluted solution. Less water means a more concentrated solution. Use whatever ratio gives you injection volumes you find practical.
What if my BAC water vial is bigger than the amount I need?
That is fine — BAC water vials are designed for multiple uses. The 10 ml size can reconstitute several peptides over a 28-day window. The 2 ml and 3 ml sizes are single-use convenience sizes for when you are reconstituting just one or two peptides.
What if the powder did not fully dissolve?
Try gently warming the vial between your palms for a minute, then continue swirling. Most peptides dissolve fully within a few minutes. If particles remain after 5 to 10 minutes of gentle agitation, contact us — that is not normal and we will help you sort it out.
Can I pre-load syringes ahead of time?
We do not recommend it. Pre-loading increases the risk of contamination and may shorten peptide stability. Draw each dose fresh from the vial just before use.
What if I accidentally shook the vial?
A single accidental shake is not always catastrophic. Let the vial settle, inspect the solution carefully, and if it is still clear with no foam or particles, it is likely still usable. If you see foaming, cloudiness, or particles, discard the vial.
Which BAC water size should I order?
If you are reconstituting just one peptide and want a fresh, single-use vial, the 2 ml or 3 ml sizes work well. If you are reconstituting multiple peptides over a few weeks, the 10 ml size is more economical. You can view our BAC water options here.
Need Help With a Specific Product?
We answer every customer message personally. If you are unsure about reconstitution for any product, reach out — we would rather walk you through it than have you make a mistake with a product you paid for.
Contact Us on WhatsAppImportant disclaimer: The information in this guide is for educational and research purposes only. It is not medical advice and should not be used to diagnose, treat, cure, or prevent any disease. Products sold by Peptides Costa Rica are intended for laboratory and research purposes only. Always consult a qualified healthcare professional before beginning any new health regimen.
