Peptide FAQ
💡 Got questions? We’ve got answers. Here’s a quick, plain-language guide to everything you need to know about peptides, storage, reconstitution, and more.
Whether you’re just getting started or diving deeper into peptide research, this FAQ is here to make everything a little simpler. We’ve answered the most common questions about storage, reconstitution, dosing, and more — all in one place.
🧪 Basics & Terminology
What exactly are peptides?
Peptides are short chains of amino acids — the building blocks of proteins — that act as messengers in the body, helping regulate many biological functions. They’re widely researched for their potential roles in areas like cellular repair, cognitive support, metabolism, and skin health.
What is reconstitution?
Reconstitution is the process of adding a sterile liquid (called a diluent) to a freeze-dried peptide powder to prepare it for research use. Learn how to do it step by step
What is bacteriostatic water and why is it used?
Bacteriostatic water is sterile water with a small amount of benzyl alcohol that slows bacterial growth. It’s commonly used as a diluent because it helps preserve peptide stability after mixing.
What’s the difference between bacteriostatic water and sterile water?
Both are sterile, but bacteriostatic water contains benzyl alcohol and can be used for multiple withdrawals from a vial, while sterile water is preservative-free and typically single-use.
What do “mcg” and “mg” mean?
These are units of measurement for peptide dosing. 1 mg (milligram) = 1,000 mcg (micrograms). Most peptides are measured in mcg.
💧 Storage & Shelf Life
How should I store peptides before mixing?
Keep lyophilized (freeze-dried) peptides in a cool, dry place, ideally refrigerated (2–8 °C / 35–46 °F). Avoid direct light and humidity.
How long do peptides last once reconstituted?
Most peptides remain stable for 2–4 weeks when stored properly in the refrigerator. Always check specific product recommendations.
Can peptides be frozen?
Some peptides can be frozen before mixing, but never freeze them after reconstitution unless the manufacturer specifically says it’s safe — freezing can damage the peptide’s structure.
How do I know if my peptide is no longer good?
Signs like discoloration, cloudiness, or visible particles usually mean it’s no longer stable and should be discarded.
📏 Reconstitution & Handling
How much bacteriostatic water should I use?
The amount depends on your desired concentration. More water = lower concentration (larger injection volume), less water = higher concentration (smaller injection volume). Our Peptide Calculator can help you determine the right amount.
What happens if I shake the vial?
Shaking can damage the peptide’s fragile structure. Always let the liquid drip down the vial wall and swirl gently to mix.
Do I need to mix the peptide immediately after receiving it?
No. Peptides are shipped lyophilized and stable. Only reconstitute them when you’re ready to use them.
💉 Measuring & Dosing (Research Use)
How do I know how much to draw into the syringe?
Use our Peptide Calculator — it converts your vial details and target dose into the exact amount to draw.
What’s the difference between “units” and “mL” on a syringe?
U-100 syringes are marked in units, not mL. There are 100 units in 1 mL, so 50 units = 0.5 mL.
What if I accidentally draw too much or too little?
Discard it and draw again. Consistency is key for reliable results.
Can I mix different peptides in the same syringe?
Generally, this is not recommended unless you have clear research justification. Mixing can affect peptide stability and results.
📦 Shipping, Traveling & Safety
Can peptides be shipped without refrigeration?
Yes — lyophilized peptides are usually stable during shipping. However, once reconstituted, they should always be kept cold.
Can I travel with peptides?
Yes, but keep them sealed, labeled, and temperature-stable. Use a small insulated bag with an ice pack and avoid temperature extremes.
What safety precautions should I take when handling peptides?
Use gloves when possible, keep your workspace sterile, and avoid touching vial stoppers with your hands.
🔍 Troubleshooting & Mistakes
My peptide won’t fully dissolve — what do I do?
Swirl gently and give it time. Some peptides dissolve slowly. If particles remain after several minutes, contact us.
I see particles or discoloration — is it safe?
No. If the solution looks abnormal, discard it, do not use it, and contact us.
I forgot to refrigerate it overnight — is it ruined?
Probably not, but its stability may be reduced. Use your best judgment and consider discarding if unsure.
More Resources
Still Have Questions?
We’re here to help. If there’s something we haven’t covered, reach out and we’ll be happy to guide you.