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

Sermorelin is dosed in micrograms, usually once a night. Enter the vial strength, the water and your dose to get the syringe mark.

IndependentThis site does not sell peptides and is not owned by a vendor. Every other calculator on page one of Google belongs to a shop.

The maths is openThe formula is written out on this page and the code behind it is a single file with an automated test suite.

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ReviewedDose ranges and half-life figures last checked 3 September 2026.

Dose to units, at the standard setup

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

Based on a 5 mg vial reconstituted with 2 mL of bacteriostatic water, which is 2.5 mg/mL, drawn on a standard U-100 insulin syringe, once daily.

About the numbers above

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.

A 5 mg vial at different water volumes

If the draw feels awkward to read, change the water rather than 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 stays in you

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.

Buying Sermorelin? The where to buy page lists the vendors this site uses and what to check before ordering, and Peptide Bureau keeps the ranked vendor scorecard.

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