Sermorelin reconstitution calculator
Sermorelin is supplied on prescription by compounding pharmacies in the United States, and is not a licensed medicine in the UK. Prepare exactly as your pharmacy instructs; these figures are arithmetic, not a prescribing instruction.
Calculator
The 9mg vial is a common compounded size and does not divide as neatly as 5 or 10, so check the units figure rather than assuming a round number.
Draw to
4.4units
on a U-100 insulin syringe (0.044 ml)
- Concentration
- 4.5 mg/ml
- 4500 mcg/ml
- Volume to draw
- 0.044 ml
- Doses per vial
- 45
- Syringe capacity
- 30 units
How this is calculated
concentration (mg/ml) = vial mg / water ml = 9 / 2 = 4.5 concentration (mcg/ml) = concentration mg/ml x 1000 = 4500 volume to draw (ml) = dose mcg / concentration mcg = 200 / 4500 = 0.044 insulin units = volume ml x 100 = 0.044 x 100 = 4.4 doses per vial = floor(water ml / volume ml) = floor(2 / 0.044) = 45 100 units = 1 ml on every U-100 insulin syringe. Barrel size changes how much it holds, never what a unit means.
How sermorelin is supplied
Sermorelin is supplied on prescription by compounding pharmacies in the United States: a 503A pharmacy prepares it against an individual prescription and dispenses it with its own preparation instructions, a specified diluent and a beyond-use date. Compounded medicines are not evaluated by the FDA for safety, efficacy or quality. In the UK it is not a licensed medicine and there is no equivalent supply route.
That distinction matters more than the arithmetic. Where a vial was dispensed on prescription, the figures that apply are the pharmacy's, and this page is a way of checking them rather than a substitute for them. Prepare exactly as your pharmacy instructs; these figures are arithmetic, not a prescribing instruction.
Vial sizes are commonly 5mg, 9mg and 15mg. The 9mg size is the one that catches people out: it does not halve or quarter into round figures, so a volume that produced a clean number on a 5mg vial will not on a 9mg one. A 9mg vial in 2ml is 4.5 mg/ml, and a 200mcg amount is 0.044ml — 4.4 units, not 4 and not 5.
Why the units figure is not rounded here
A U-100 barrel is graduated in whole units, and the temptation with 4.4 is to call it 4. That is a different quantity — about a tenth less — and on a vial size that produces awkward figures it is a systematic error rather than a one-off. The calculator keeps a decimal place deliberately, so the gap between the arithmetic and what a barrel can actually show is visible rather than silently absorbed.
Where a figure falls between graduations, the choices are a different water volume that produces a readable number, or a finer barrel. A 0.3ml syringe has the closest-spaced graduations of the three common sizes, which is why it suits the small volumes sermorelin usually produces.
Storage and stability, in general terms
Sealed lyophilised vials keep well cool, dry and out of light. Reconstituted, the solution requires refrigeration and has a much shorter life — weeks rather than months — shortened further by heat, light and agitation. Bacteriostatic water, which carries a benzyl alcohol preservative, is what allows a vial to be entered repeatedly; plain sterile water is a single-use diluent and behaves differently after the first entry.
Where the vial was dispensed on prescription, the pharmacy's own preparation and storage instructions are the ones that apply, and they override any general figure. Where it was not, there is no authoritative window to quote, and this page does not invent one.
Frequently asked questions
How much bacteriostatic water for a 9mg sermorelin vial?
2ml and 3ml are both common. 2ml gives 4.5 mg/ml and 3ml gives 3 mg/ml, and the calculator shows what each does to the units figure. Where the vial was dispensed by a pharmacy, use the volume on its instructions rather than a general convention.
Why is my units figure not a whole number?
Because 9mg and 15mg vials rarely divide into round figures. A 9mg vial in 2ml puts a 200mcg amount at 4.4 units. The calculator keeps the decimal rather than rounding, because 4.4 shown as 4 is a different quantity and the difference is systematic, not occasional.
Does the 15mg vial change anything except concentration?
No. It holds more peptide, so at the same water volume it is a higher concentration and any given amount occupies fewer units — and the vial goes further. The amount itself is unchanged; only its distance on the barrel moves.
Which syringe suits sermorelin?
A 0.3ml insulin syringe holds 30 units and has the finest graduations, which suits the small volumes sermorelin usually produces. A unit is one hundredth of a millilitre on every U-100 syringe, so barrel size changes what fits and how finely you can read it, never what a unit is worth.
Is sermorelin a prescription medicine?
In the United States it is supplied on prescription by compounding pharmacies, and compounded medicines are not FDA-evaluated for safety, efficacy or quality. In the UK it is not a licensed medicine and there is no equivalent supply route. Prepare exactly as your pharmacy instructs; these figures are arithmetic, not a prescribing instruction.
Before you use this
This tool performs arithmetic only. It does not recommend a dose, a frequency, a duration or a supplier. Many peptides discussed online are not approved by the FDA for the uses people describe. Compounded medicines are supplied on prescription and should be prepared exactly as your pharmacy instructs. Talk to a prescriber or pharmacist before preparing or administering anything.