How to reconstitute a peptide vial

Your vial holds a small amount of white powder. Sometimes you can barely see it. It has been freeze-dried, which is what the word lyophilized on some labels means. Reconstituting it just means adding bacteriostatic water so the powder dissolves and you can measure it with a syringe.

Work out how much water first. Once it is in, you cannot take it back out. Use a calculator before you open anything.

What you need in front of you

This is not a shopping list, and we have no vendor links. But it helps to see what a real manufacturer puts in the box, because it settles arguments no forum post can. EGRIFTA SV is an approved peptide you mix the same way, and its FDA label lists what ships in the box for 30 injections:

60 sterile 1 mL syringes · 60 sterile 1″ 20-gauge needles, used for mixing · 30 sterile ½″ 30-gauge needles, used for injection · 60 alcohol swabs

Three things stand out. Two needles per dose, not one — a thicker, longer one for punching through rubber tops, and a thinner, shorter one for the injection. Two syringes per dose, for the same reason. And two swabs, because there are two rubber tops to wipe.

Here is why. A needle goes blunt every time it punches rubber. If you draw the water, punch the peptide vial, then inject with the same tip, the injection gets the dullest version of that needle. The manufacturer splits them up for exactly that reason. Almost nobody mentions it next to the math.

The steps

1. Let the vial warm up to room temperature. Cold glass sweats, and you can see the powder better once the vial is dry.
2. Wipe both rubber tops with a fresh alcohol swab — the peptide vial and the water vial. Let them air dry on their own. Do not fan them or blow on them.
3. Draw up your measured bacteriostatic water. If the calculator said 2.00 mL and your syringe only holds 1 mL, that is two full syringes.
4. Tilt the needle so the water runs down the inside of the glass. Do not fire it straight at the powder. The force alone can wreck the peptide.
5. Let it dissolve on its own. Most blends go clear in under a minute. If anything is left, roll the vial gently between your palms, or swirl it.
6. Never shake it. Shaking foams the liquid and snaps the peptide chains apart. If foam sticks around, you shook it.
7. Put it in the fridge. See storage for what we do and don't know about how long it keeps.

Does the powder add volume?

Yes, a little. Our calculators ignore it on purpose. Here is exactly how much we are ignoring, so you can decide if you agree.

When a solid dissolves, it still takes up room in the liquid. For proteins and peptides the usual figure is about 0.73 mL per gram of powder. That is a textbook number for proteins in general. Nobody measured it for the compounds on this site — we are borrowing it, not citing it.

80 mg of powder × 0.73 mL/g = 0.058 mL
Add 2.50 mL of water and you have roughly 2.56 mL of solution, not 2.50.
The real concentration is about 2.3% lower than the arithmetic says.

Two percent. On a 10 unit draw that is one fifth of a single unit. No syringe has a mark that fine, and you could not read it by eye anyway. Correcting for it would add a decimal your syringe cannot show. So we do not correct for it. Now you know the number instead of wondering about it.

It stops being tiny if you go very strong. Put the same 80 mg into 0.5 mL and the powder is 10% of what ends up in the vial. If you work at that end, the math on this site runs optimistic, and you should know that.

What should it look like

Clear and colorless, for most peptides. Anything with GHK-Cu in it turns blue — that is Glow and KLOW — because the molecule carries copper. The blue is supposed to happen. It is not contamination.

Stop and ask your supplier if you see cloudiness, floating bits, or anything that still will not dissolve after a few minutes of gentle swirling.

How many draws you actually get

The calculators divide the vial and give you a whole number: 25 draws, 20 draws. The math is right. Real life is worse. Liquid gets stranded in places you cannot get it back from — inside the needle, in the plastic hub, in the film clinging to the glass, in the last few drops the tip cannot reach.

So you will get fewer draws than the number says, and the last one is the one that comes up short. How much fewer, we cannot tell you. It depends on your needle length and bore, how your syringe hub is built, and how the vial sits when you tip it. We cannot see any of that, and we found no sourced figure that applies to unbranded vials.

So plan for a short last draw instead of being surprised by it. If your schedule has to reach a certain date, count back from one draw fewer than the table shows.

Water: use the right one

Bacteriostatic water has a preservative in it. The FDA label lists 0.9% (9 mg/mL) or 1.1% (11 mg/mL) benzyl alcohol, so both strengths are real. That preservative is the only reason you can put a needle into the vial more than once. Sterile water and saline have none. Mix with those and the vial is single use. The two labels, side by side.