How many units is 200 mcg of Sermorelin?

It depends entirely on how much water you added. In a 5 mg vial reconstituted with 2 mL, the concentration is 2.5 mg/mL, so 200 mcg is 0.08 mL, which is 8 units on a U-100 insulin syringe. In the same vial with 1 mL of water it is 4 units, and with 3 mL it is 12 units.

How much bacteriostatic water for a 5 mg Sermorelin vial?

2 mL is the usual choice. It gives 2.5 mg/mL, which puts the commonly reported range of 100 mcg to 500 mcg between roughly 4 and 20 units. Aim for a draw between about 10 and 50 units, where the barrel is easiest to read, and add or remove water to get there.

How many doses are in a 5 mg vial?

Divide 5 by your dose. At 200 mcg that is 25 doses, which at once daily is 25 days.

How many units is 200 mcg of sermorelin?

In a 5 mg vial with 2 mL of water, 8 units. In the same vial with 1 mL, 4 units.

My sermorelin came as a liquid. How do I use the calculator?

Use the concentration on the label. If it says 3 mg/mL, that is the same as a 3 mg vial reconstituted with 1 mL. Enter those two numbers and your dose.

Sermorelin dosage calculator

In a 5 mg vial with 2 mL of water (2.5 mg/mL), 200 mcg of Sermorelin is 8 units on a U-100 insulin syringe. Sermorelin is dosed in micrograms, usually once a night.

Reviewed 3 September 2026
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Dose to units at the usual vial and water

Dose	U-100 units	Draw	Doses per vial	Vial lasts
100 mcg	4 units	0.04 mL	50	50 days
200 mcg	8 units	0.08 mL	25	25 days
300 mcg	12 units	0.12 mL	16	16 days
400 mcg	16 units	0.16 mL	12	12 days
500 mcg	20 units	0.2 mL	10	10 days

5 mg vial in 2 mL of bacteriostatic water (2.5 mg/mL), U-100 insulin syringe, once daily.

About Sermorelin

Sermorelin is a 29 amino acid fragment of growth hormone releasing hormone. It was once a licensed diagnostic and paediatric product and is now mostly seen through compounding pharmacies and research vendors. It has a very short half-life, which is why it is dosed close to sleep, when the natural growth hormone pulse occurs.

A 5 mg vial reconstituted with 2 mL gives 2,500 mcg/mL, so 200 mcg is 0.08 mL, or 8 units. Compounded sermorelin from a pharmacy often comes already reconstituted at a stated concentration, in which case skip the vial and water fields and use the mg to units page with the concentration printed on the label.

The same 5 mg vial at other water volumes

If the draw is awkward to read, change the water, not the dose. The dose stays the same; only the mark moves.

Vial	BAC water	Concentration	Draw	U-100 units	Doses/vial
5 mg	1 mL	5 mg/mL	0.04 mL	4 units	25
5 mg	2 mL	2.5 mg/mL	0.08 mL	8 units	25
5 mg	3 mL	1.67 mg/mL	0.12 mL	12 units	25
10 mg	1 mL	10 mg/mL	0.02 mL	2 units	50
10 mg	2 mL	5 mg/mL	0.04 mL	4 units	50
10 mg	3 mL	3.33 mg/mL	0.06 mL	6 units	50

All rows above assume a 200 mcg dose and a standard U-100 insulin syringe, where 100 units = 1 mL.

How long it lasts in the body

The half-life of Sermorelin is about 12 minutes. That is the time for the amount in your blood to halve, so after one half-life you are at 50 percent of the peak, after two you are at 25 percent, and after four you are at roughly 6 percent. It is gone within an hour or two. What it triggers (a growth hormone pulse, for instance) lasts longer than the peptide itself, which is why timing matters more than the exact number of minutes.

Common questions

How many units is 200 mcg of Sermorelin?: It depends entirely on how much water you added. In a 5 mg vial reconstituted with 2 mL, the concentration is 2.5 mg/mL, so 200 mcg is 0.08 mL, which is 8 units on a U-100 insulin syringe. In the same vial with 1 mL of water it is 4 units, and with 3 mL it is 12 units.
How much bacteriostatic water for a 5 mg Sermorelin vial?: 2 mL is the usual choice. It gives 2.5 mg/mL, which puts the commonly reported range of 100 mcg to 500 mcg between roughly 4 and 20 units. Aim for a draw between about 10 and 50 units, where the barrel is easiest to read, and add or remove water to get there.
How many doses are in a 5 mg vial?: Divide 5 by your dose. At 200 mcg that is 25 doses, which at once daily is 25 days.
How many units is 200 mcg of sermorelin?: In a 5 mg vial with 2 mL of water, 8 units. In the same vial with 1 mL, 4 units.
My sermorelin came as a liquid. How do I use the calculator?: Use the concentration on the label. If it says 3 mg/mL, that is the same as a 3 mg vial reconstituted with 1 mL. Enter those two numbers and your dose.

IndependentThis site does not sell peptides and is not owned by a vendor.

The maths is openThe formula is on every page and in the methodology. The code is one file with an automated test suite, run before each deploy.

How it is fundedNo ads and no vendor links here. It is published by the team behind Peptide Bureau, which earns from affiliate links on its own site, and VialHaus, the same team's vial storage shop, which the storage notes link to.

ReviewedDose ranges and half-lives checked 3 September 2026.

Buying Sermorelin?

Peptulator does not list, rank or link vendors. Whoever the supplier is, use the strength printed on your own vial and check the batch certificate of analysis before you rely on any number here.

The Sermorelin guideDosing, evidence and side effects, at Peptide Bureau Read a syringeU-100 vs U-40, and the 2.5x error Build a full protocolThe stack builder at Peptide Bureau, about two minutes

Common conversions

The same three-step maths, pre-filled for the doses people ask about most. Units on a U-100 insulin syringe, where 100 units is 1 mL.

mg to units calculator Any dose at any concentration, both directions, with the full reference tables
Units to mg calculator What the units you drew are in milligrams
1 mg to units The most-asked conversion, at every common setup

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Before you use these numbers This is a unit-conversion tool. It turns a vial strength and a water volume into a concentration, a draw volume and a syringe mark. It does not tell you what to take, whether to take it, or whether a compound is safe for you. Most compounds listed are sold for laboratory research and are not approved for human use. Nothing here is medical advice. Dosing decisions belong with a licensed clinician who knows your history. Always check the strength printed on your own vial rather than trusting a preset.