Already a liquid? Identifying a pre-reconstituted peptide
Most peptides arrive as a dry powder you mix yourself. Some ship pre-mixed as a liquid. If your vial is already liquid, you don't reconstitute it — but you must know its concentration before you dose.
Tip and look. If the contents move and slosh like water, it's a liquid (pre-mixed). If you see only powder, a dried puck, or a barely-visible film, it's lyophilized — use the main calculator to reconstitute it.
Liquid products are often labeled "pre-mixed," "pre-reconstituted," or "solution," and usually show a concentration.
Some come with a dropper or in a larger bottle rather than a small stoppered vial.
🏷️ Find the concentration on the label
The number you need is the concentration — how much peptide is in each millilitre of liquid. It looks like:
mg/mL — e.g. "5 mg/mL" means 5 milligrams of peptide in every 1 mL.
mcg/mL — e.g. "250 mcg/mL".
Sometimes shown as a total plus a volume — e.g. "10 mg / 2 mL", which is 5 mg/mL (divide the mg by the mL).
If a concentration IS on the label, you're good — enter it below to get your draw.
If there is NO concentration on the label — and it doesn't list a total mg and a volume you can divide — then you do not know how strong it is, and you cannot dose it safely. ⛔ Do not use it. Contact whoever supplied the bottle and get the concentration (mg/mL) and intended dose in writing before you take anything. Guessing here is how people seriously over- or under-dose.
🧮 Dose calculator for a liquid (known concentration)
First, tell us what kind of number your bottle gives you. Then fill in the rest — we'll work out the volume and the units to draw on a U-100 insulin syringe.
Pick whichever matches what's actually printed on your vial or cap.
If the label shows "10 mg / 2 mL", that's 5 mg/mL.
units =
"Units" = the marks on an insulin syringe (100 units = 1 mL). Example for retatrutide: a cap reading "10 units = 2 mg" → type 10 and 2.
From the research range for your peptide.
Draw syringe to
5 units
Volume
0.05 mL
Concentration
5 mg/mL
Doses per mL
20
📲 Save to your phone:
🧊 Handling a liquid product
Keep it refrigerated and out of light, just like a reconstituted vial.
Note whether the carrier is bacteriostatic (has a preservative, lasts ~weeks) or preservative-free (shorter shelf life). If unsure, ask the supplier.
Swab the stopper before every draw; never reuse needles.
Discard if it turns cloudy, develops particles, or changes color.
See something off, or want a peptide added? If you notice anything wrong, incorrect, or missing — a peptide you'd like
us to add research for, or a feature that isn't working the way it should — please tell us at
info@peptide-dose.com. This is a community harm-reduction tool and we want it to be accurate.