To reconstitute sermorelin, you slowly add bacteriostatic water to the powdered (lyophilized) peptide, swirl gently until it dissolves, and store the mixed vial in the refrigerator at 36–46°F (2–8°C), using it before the beyond-use date on the pharmacy label. That is the short answer. The details matter, though: how much water you add sets the concentration, and the concentration decides how many units you draw on the syringe for every dose. This guide covers sermorelin reconstitution and storage step by step, along with the dosing math and the mistakes that most often waste a vial.
One note before starting: always follow the instructions on your pharmacy label and from your prescribing clinician. Some compounding pharmacies dispense sermorelin already in solution. If your vial arrives as a liquid, skip the mixing steps and go straight to the storage section.
Why Does Sermorelin Need to Be Reconstituted?
Sermorelin is a 29-amino-acid peptide, a fragment of growth hormone-releasing hormone (GHRH), and like most peptides it breaks down fairly quickly in water. Compounded sermorelin is therefore usually freeze-dried into a powder, which keeps it stable during shipping and storage. Once you add liquid, the clock starts. That is why reconstituted sermorelin is refrigerated and carries a much shorter beyond-use date than the dry powder does. If you want the background on what the peptide does once it is injected, see how sermorelin works.
What Do You Need to Reconstitute Sermorelin?
- The sermorelin vial, with the label showing total milligrams (for example, 15 mg).
- Bacteriostatic water: sterile water containing 0.9% benzyl alcohol, which limits bacterial growth across the repeated needle punctures of a multi-dose vial. Use only the diluent your pharmacy supplies or specifies.
- A mixing syringe large enough to measure the diluent volume accurately (often a 3 mL or 5 mL syringe).
- Alcohol swabs for both vial stoppers.
- U-100 insulin syringes for the daily doses.
- A sharps container for used needles.
How to Reconstitute Sermorelin: Step by Step
- Wash your hands and work on a clean, dry surface.
- Let both vials reach room temperature for a few minutes if they were refrigerated. This makes the powder dissolve more easily.
- Remove the plastic caps and swab both rubber stoppers with alcohol. Let them air-dry.
- Draw the prescribed volume of bacteriostatic water into the mixing syringe. Your label or clinician will specify this volume, because it sets the final concentration.
- Inject the water slowly down the inside wall of the sermorelin vial. Do not spray it directly onto the powder. A forceful stream can damage the peptide and cause foaming.
- Swirl or roll the vial gently between your palms until the powder fully dissolves, usually within a minute or two. Do not shake it.
- Inspect the solution. It should be clear and colorless. If it stays cloudy, discolored, or has visible particles, do not use it. Contact your pharmacy.
- Write the mixing date on the vial and refrigerate it right away.
How Much Bacteriostatic Water Do You Add?
Concentration equals total peptide divided by total volume. A 15 mg vial mixed with 5 mL of bacteriostatic water gives 3 mg/mL, which is RespondWell’s published concentration for its 15 mg sermorelin vial. The same 15 mg mixed with 7.5 mL would give 2 mg/mL. Neither one is “more” sermorelin. The total is the same, and only the volume per dose changes. Use the volume on your label so that your syringe markings match your prescription.
How Many Units Should You Draw? The Dosing Math
On a U-100 insulin syringe, 100 units equal 1 mL, so 1 unit equals 0.01 mL. At 3 mg/mL (3,000 mcg/mL), each unit holds 30 mcg of sermorelin. That works out as follows:
| Dose | Volume at 3 mg/mL | Units on a U-100 syringe |
|---|---|---|
| 200 mcg | 0.067 mL | ~7 units |
| 300 mcg | 0.10 mL | 10 units |
| 400 mcg | 0.133 mL | ~13 units |
| 500 mcg | 0.167 mL | ~17 units |
At a different concentration, the units change. Always confirm your exact draw with your clinician, especially while you are titrating up. For the titration schedule and the timing of injections, see the sermorelin dosage and timing guide. For why total milligrams and concentration both matter, see sermorelin vial size explained.
How Should You Store Sermorelin?
Before Mixing (Powder)
Store the powder as your pharmacy label directs. Refrigeration is common, and the powder should be kept away from heat, moisture, and direct light. It is generally more stable than the mixed solution, but it is not indestructible. Leaving it in a hot car or a sunny window can degrade it.
After Mixing (Solution)
- Refrigerate at 36–46°F (2–8°C). Store it in the main body of the fridge, not the door, where the temperature swings more.
- Do not freeze it. Freezing can damage the peptide. Discard any vial that has frozen.
- Protect it from light. Keep the vial in its box or another opaque container.
- Respect the beyond-use date. The pharmacy sets this date based on the formulation. Discard any solution left over after that date, even if the vial is not empty.
- Traveling? Use an insulated case with a cold pack, and don’t let the vial touch the ice pack directly.
What Are the Most Common Reconstitution Mistakes?
- Shaking the vial instead of swirling it gently.
- Adding the wrong volume of water, so that the syringe units no longer match the prescribed dose.
- Using sterile water instead of bacteriostatic water in a multi-dose vial without the pharmacy’s direction. Without a preservative, the vial’s usable life is much shorter.
- Leaving the vial at room temperature between doses.
- Reusing insulin syringes. Each needle is single-use.
Injection-site redness or mild irritation can occur even with good technique. For what’s normal and when to call your clinician, see sermorelin side effects.
Sermorelin Reconstitution FAQ
Can sermorelin be left out of the fridge?
Mixed sermorelin should be refrigerated whenever it is not being drawn up. Brief time at room temperature while you prepare a dose is expected. Extended or repeated exposure to warmth may reduce its potency. If a vial was left out for many hours, or exposed to heat, ask your pharmacy whether to replace it.
How long does reconstituted sermorelin last?
It lasts until the beyond-use date the compounding pharmacy assigns. This date varies by formulation and diluent, so the label on your vial is the authority, not a general rule from the internet. Writing the mixing date on the vial makes the date easy to track.
What should reconstituted sermorelin look like?
It should be clear and colorless, with no particles. Cloudiness, discoloration, or floating material are signs not to inject it. Contact your pharmacy for a replacement.
Get Sermorelin With Clear Instructions From Day One
Correct reconstitution and storage protect both the peptide and the accuracy of every dose. RespondWell dispenses sermorelin in a 15 mg vial with a published 3 mg/mL concentration, so the syringe math is never a guess, and a licensed clinician guides your titration and lab monitoring. Explore RespondWell’s treatment options to see current sermorelin availability and get started.