Who this guide is for
This guide is for men whose peptide arrives as a dry powder in a small glass vial and who need to turn it into an injectable liquid at home. It assumes a clinician has already shown you the process once in person. Use it as a reference for the second, third and tenth time, when the steps are easy to forget and the math is easy to get wrong.
Two things in this process are not yours to decide: which liquid to add and how much of it. Both come from your pharmacy label or your provider, and both change the strength of every dose that follows. Everything below assumes you have those two numbers in writing before you begin.
If your product came from a “research use only” website, stop here. Those products are not made for people, the contents of the vial are not verified, and no amount of careful mixing fixes that. Our page on whether research peptides are safe explains why.
Know your liquid before you start
Bacteriostatic water is sterile water with about 0.9% benzyl alcohol added as a preservative. Its DailyMed label describes it as a multiple-dose diluent and adds a line worth remembering: do not store reconstituted drugs unless the maker of the drug directs it. In other words, the medicine’s own label decides how long a mixed vial lasts, not the water.
Products really do differ. Two versions of the same peptide, tesamorelin, show how much:
| Product | Liquid the label names | Volume | After mixing |
|---|---|---|---|
| Egrifta WR | Bacteriostatic Water for Injection (supplied) | 1.3 mL | Room temperature; discard 7 days after mixing |
| Egrifta SV | Sterile Water for Injection (supplied) | 0.5 mL | Use immediately; discard what is left |
| Compounded peptides | Named on the pharmacy label | Named on the pharmacy label | Pharmacy’s beyond-use date |
Our page on bacteriostatic water covers the difference between diluents in more depth.
Mixing a vial, step by step
Supplies checklist
- The peptide vial, checked for the right name, strength and expiry date
- The diluent your label names, unopened or within its own dating
- Alcohol swabs, one per stopper
- A syringe for drawing the diluent, as shown at your lesson
- Your written plan with the diluent volume and dose
- A sharps container and a pen or tape for dating the vial
The steps
- Wash your hands with soap and water and work on a clean, dry surface away from the sink splash zone.
- Look at the powder. It should be a dry cake or loose powder in an intact vial. A cracked vial or one that looks wet goes back to the pharmacy.
- Remove the caps and swab both rubber stoppers. Let them air-dry rather than blowing on them.
- Draw the exact diluent volume from your written plan. Check the syringe at eye level before you move on.
- Add it slowly down the inside wall of the glass, not straight onto the powder. Fast spraying whips up foam.
- Swirl or roll the vial gently between your palms. Both Egrifta labels say to mix gently and not to shake, and the same rule protects compounded peptides.
- Wait and inspect. Let any bubbles settle. The liquid should be clear and free of particles before you use it.
- Date the vial with the mixing date and the discard date from your label.
- Store it as the label says, usually in the refrigerator for compounded peptides; our guide to storing peptides and injectables has the details by product.
Once a multi-dose vial has been punctured, the CDC’s injection safety guidance calls for it to be dated and discarded within 28 days unless the manufacturer gives a different date. Compounded peptides follow the pharmacy’s beyond-use date when that is shorter.
The units math, with a worked example
Peptide doses are written in milligrams (mg) or micrograms (mcg), but insulin syringes are marked in “units.” Those syringe units are simply volume. MedlinePlus explains that standard U-100 insulin has 100 units in 1 mL and that each small notch on a standard 1 mL insulin syringe is 1 unit. So on any U-100 syringe, 1 unit equals 0.01 mL.
That gives you a three-step chain:
| Step | Formula |
|---|---|
| 1. Strength of the mixed vial | mg in the vial ÷ mL of diluent added = mg per mL |
| 2. Amount in one syringe unit | mg per mL × 0.01 = mg per unit (multiply by 1,000 for mcg) |
| 3. Units to draw | your written dose ÷ amount per unit = units |
Worked example
The numbers below are invented to show the arithmetic. They are not a dose for any peptide.
- A vial contains 5 mg of powder, and the plan says to add 2 mL of bacteriostatic water.
- Strength: 5 mg ÷ 2 mL = 2.5 mg per mL, which is 2,500 mcg per mL.
- Per unit: 2,500 mcg × 0.01 = 25 mcg in each syringe unit.
- If the written plan says a dose of 300 mcg, then 300 ÷ 25 = 12 units on the syringe.
Now change only the water. Had the same 5 mg vial been mixed with 1 mL, the strength doubles to 5 mg per mL, each unit holds 50 mcg, and the same 300 mcg dose is just 6 units. Same powder, same dose, half the volume. That is exactly why the diluent volume has to match the plan that was written for it.
Habits that prevent mistakes
- Write the conversion on the vial when you mix it, for example “1 unit = 25 mcg.”
- Keep a dose card in the fridge showing your dose in mcg and the matching number of units, copied from your plan.
- Use the same syringe type every time. A 0.3 mL or 0.5 mL insulin syringe spreads the marks further apart, which makes small volumes easier to read, but each unit is still 0.01 mL on a U-100 scale.
- Never swap in a syringe marked only in mL without redoing the math with your clinician.
- Recheck after any change: a new vial strength, a new pharmacy or a new diluent volume means new numbers.
- Watch the calendar. If a vial runs out noticeably sooner or later than your plan predicts, something in the math is off. Call before the next dose.
What to watch for, and when to call
Mixing problems show up in the vial, and injection problems show up on your skin.
Do not use the vial, and call the clinic or pharmacy, if:
- The liquid stays cloudy, has specks or strands, or has changed color
- The vial was frozen, left in a hot car or kept past its discard date
- You are unsure how much diluent went in
Call the clinic at 626-319-5261 if you notice:
- Redness, warmth or a firm lump at an injection site that grows over a day or two
- Fever after an injection, or pus at the site
- A dose that you think was drawn wrong, before you take another one
Call 911 for swelling of the face, lips or throat, hives with trouble breathing, chest pain, fainting, or sudden weakness or slurred speech after an injection.
Used syringes go in a sharps container, never loose in the trash; our guide to needle disposal in Los Angeles County lists drop-off options.
How Ultimate Male teaches reconstitution
Through our peptide therapy program at San Gabriel and Downey, nobody mixes a vial alone the first time. After labs and a one-on-one consultation with a PA-C or MD, your peptide comes from a licensed U.S. compounding pharmacy, or as the approved product for tesamorelin, and a clinician walks you through mixing, the units math for your exact vial and the first injection in person, using the small insulin-type syringe. You leave with the diluent volume, your dose in both mcg and units, and the discard date written down.
If you are still deciding whether peptides make sense, our guide to your first peptide therapy consultation explains the visit. Questions about a vial you already have can go to the free 10-minute call at 626-319-5261.
