Peptide reconstitution calculator
Enter your vial size and how much bacteriostatic water you are adding. You get the units to draw on a U-100 syringe, how many doses the vial holds, and — the part no other calculator does — what each dose costs at the cheapest price we can find today.
How reconstitution maths works
Concentration is milligrams in the vial divided by millilitres of water added. A 10mg vial with 2mL of bacteriostatic water is 5mg/mL. That single number drives everything else.
A U-100 insulin syringe is marked so that 100 units is one millilitre. Units to draw are therefore your dose divided by the concentration, multiplied by 100 — at 5mg/mL, a 0.25mg dose is 5 units on the barrel.
Adding more water does not dilute what you have in any meaningful sense: the vial still holds the same milligrams. It changes how many syringe marks a dose spans, which is purely a question of how accurately you can measure. More water means more units per dose and an easier draw; less water means fewer, larger marks.
Cost per dose is the only part that needs outside information: your dose in milligrams times the going rate per milligram. We hold that rate for every compound below and refresh it nightly, so the figure reflects what the market charges today rather than a number typed into a page once.
A calculator for each of 63 compounds
Each one opens pre-loaded with the vial sizes vendors actually sell for that compound, and prices your dose against its cheapest current listing.
Common questions
How do I reconstitute a peptide?
Add bacteriostatic water to the vial. The amount you add sets the concentration: milligrams in the vial divided by millilitres of water. A 10mg vial with 2mL of water is 5mg/mL. The water does not change how much compound you have — only how finely you can measure it.
How many units do I draw on an insulin syringe?
A U-100 syringe is marked so 100 units is 1mL. Units to draw = your dose divided by the concentration, times 100. At 5mg/mL, a 0.25mg dose is 5 units. The calculator above does this as you type.
How much bacteriostatic water should I add?
There is no single correct amount — it only changes the units per dose. 1mL to 3mL per vial is the usual range. Pick whatever puts your dose somewhere easy to read on the syringe rather than at one or two marks.
What does a dose actually cost?
Your dose in milligrams times the cheapest price per milligram we can find. That is the part no other calculator does: ours is wired to live prices from 38 US retail vendors at the deepest, re-read every night, so the cost figure moves with the market.
Do you sell peptides?
No. We sell nothing and ship nothing. Every price here is read from a vendor's own public storefront.