Calculator

Reconstitution calculator

Mass, diluent and dose, in whichever direction you have the numbers. It shows the working and warns when a dose cannot be drawn accurately.

Last updated 12 August 2026

What do you know? I know the diluent — what will it be? I want a concentration — how much diluent? I want a dose to be N units — how much diluent? My vial is already mixed — what do I draw?

Vial contents optional here mg Diluent added mL Dose optional Concentration you want mg/mL Dose mcg Units you want to draw units Concentration on the vial Dose Syringe

10 unitson a U-100

Volume per dose	0.1 mL
Concentration	2.5 mg/mL	2,500 mcg/mL
Doses per vial	20

What the marks hold
10 units	0.1 mL	250 mcg
20 units	0.2 mL	500 mcg
50 units	0.5 mL	1.25 mg
100 units	1 mL	2.5 mg

Exact, not rounded to the nearest mark. A U-100 barrel is graduated every 2 units, so 13.4 sits between marks.

How to actually do it

Draw the diluent into a syringe. A larger syringe than the dosing one is easier here.
Aim down the inside wall of the vial, not at the powder. A jet straight onto the powder is the most common way to damage a peptide during reconstitution.
Let it run in slowly under its own vacuum rather than forcing it.
Swirl gently until dissolved. Do not shake. Shaking foams the solution and shears the peptide; foam also makes an accurate draw impossible.
If anything remains undissolved after a few minutes, leave it and swirl again rather than agitating harder.
Label the vial with the date of first puncture — that is what the beyond-use date counts from, not the date you bought it.

These are handling conventions, not a claim about any specific compound's stability. Where a compound has its own handling requirement on file, it is on that compound's record.

The formula

mass ÷ diluent  = concentration
dose ÷ concentration = volume
volume × factor = units on the barrel   (U-100 → 100, U-40 → 40, U-500 → 500)

A U-40 syringe multiplies by 40 instead of 100, and a U-500 by 500. Getting that factor wrong is the most consequential arithmetic error in this domain, which is why the syringe is a field rather than an assumption.

Worked examples

Computed on the server, so they are readable whether or not the calculator above runs.

Vial	Diluent	Concentration	Dose	Draw	Doses
5 mg	2 mL	2.5 mg/mL	250 mcg	10 units	20
10 mg	2 mL	5 mg/mL	500 mcg	10 units	20
2 mg	1 mL	2 mg/mL	100 mcg	5 units	20

Working backwards

The most useful direction, and the one most calculators lack. If you want a 250 mcg dose to land on exactly 10 units — easy to draw, hard to misread — this is the diluent that gets you there:

10 units ÷ 100 = 0.1 mL per dose
250 mcg ÷ 0.1 mL = 2500 mcg/mL needed
5 mg ÷ 2.5 mg/mL = 2 mL of diluent

Round numbers on the barrel are worth engineering for. A dose that reads as "10 units" is misread far less often than one that reads as "7.5".

Per-compound presets

36 compounds have reconstitution values on file. Each links to its record.

Compound	Vial	Diluent	Concentration	Typical draw
5-Amino-1MQ	2 mg	2 mL	1000 mcg/mL	25 units
Adamax	2 mg	2 mL	1000 mcg/mL	5 units
AOD-9604	2 mg	2 mL	1000 mcg/mL	25 units
ARA-290	10 mg	2 mL	5000 mcg/mL	80 units
BPC-157	2 mg	2 mL	1000 mcg/mL	25 units
Cartalax	10 mg	2 mL	5000 mcg/mL	40 units
CJC-1295 DAC	10 mg	2 mL	5000 mcg/mL	40 units
CJC-1295 no-DAC	2 mg	2 mL	1000 mcg/mL	10 units
DSIP	2 mg	2 mL	1000 mcg/mL	10 units
Epitalon	10 mg	2 mL	5000 mcg/mL	100 units
FOXO4-DRI	10 mg	2 mL	5000 mcg/mL	20 units
GHK-Cu	10 mg	2 mL	5000 mcg/mL	20 units
GHRP-2	2 mg	2 mL	1000 mcg/mL	10 units
GHRP-6	2 mg	2 mL	1000 mcg/mL	10 units
Ipamorelin	2 mg	2 mL	1000 mcg/mL	10 units
Kisspeptin-10	2 mg	2 mL	1000 mcg/mL	10 units
KPV	2 mg	2 mL	1000 mcg/mL	20 units
Melanotan I	5 mg	2 mL	2500 mcg/mL	20 units
Melanotan II	2 mg	2 mL	1000 mcg/mL	25 units
MOTS-c	10 mg	2 mL	5000 mcg/mL	100 units
P21	2 mg	2 mL	1000 mcg/mL	10 units
Pinealon	10 mg	2 mL	5000 mcg/mL	20 units
PT-141	10 mg	2 mL	5000 mcg/mL	35 units
Retatrutide	2 mg	2 mL	1000 mcg/mL	25 units
Selank	2 mg	2 mL	1000 mcg/mL	25 units
Semaglutide	2 mg	2 mL	1000 mcg/mL	10 units
Semax	2 mg	2 mL	1000 mcg/mL	20 units
Sermorelin	2 mg	2 mL	1000 mcg/mL	20 units
SS-31	10 mg	2 mL	5000 mcg/mL	100 units
TB-500	10 mg	2 mL	5000 mcg/mL	40 units
Tesamorelin	10 mg	2 mL	5000 mcg/mL	20 units
Thymalin	10 mg	2 mL	5000 mcg/mL	100 units
Thymosin alpha-1	10 mg	2 mL	5000 mcg/mL	32 units
Thymosin Beta-4	10 mg	2 mL	5000 mcg/mL	40 units
Thymulin	10 mg	2 mL	5000 mcg/mL	100 units
Tirzepatide	5 mg	2 mL	2500 mcg/mL	20 units