Tools · Sermorelin dosing math
Sermorelin Dosing Calculator
Most sermorelin questions come down to one awkward translation: a milligram strength on a vial and a microgram dose on a script have to become a tiny number of units on a U-100 insulin syringe. This calculator does that conversion in the open — concentration, units to draw, doses per vial — and adds a note on the bedtime timing sermorelin is usually given for. It is math, not a dose recommendation.
Read before you use this
This is an educational math tool, not medical advice, and not a recommendation to use sermorelin. Sermorelin is prescription-only and typically compounded; your dose, reconstitution, injection technique, and timing must be directed and supervised by a licensed clinician. Never self-prescribe or change a dose on your own. Treat every figure below as a starting point to verify against your prescriber and the product label — confirm the vial strength, the water you added, and the prescribed dose before drawing anything.
Draw on a U-100 insulin syringe
8units
to deliver a 200 mcg dose of sermorelin = 0.08 mL.
- Concentration
- 2.5 mg/mL
- 5 mg ÷ 2 mL
- Volume to inject
- 0.08 mL
- 0.2 mg ÷ 2.5 mg/mL
- Doses per vial
- 25
- 5 mg ÷ 0.2 mg
A note on timing
Sermorelin is conventionally injected at night, before bed, on an empty stomach, so its growth-hormone-releasing effect lines up with the body’s largest natural GH pulse during early slow-wave sleep. A high-carbohydrate or high-fat meal close to the injection can blunt that pulse. This is a general convention, not a rule for you — your prescriber sets your actual schedule, and this tool does not change it.
How it is calculated. Concentration = vial (mg) ÷ bacteriostatic water (mL). Volume to inject = dose (mg) ÷ concentration, where dose (mg) = dose (mcg) ÷ 1000. A U-100 insulin syringe holds 100 units per 1 mL, so units to draw = volume (mL) × 100. Doses per vial = vial (mg) ÷ dose (mg). Worked example: a 5 mg vial reconstituted with 2 mL = 2.5 mg/mL; a 200 mcg dose = 0.08 mL = 8 units, giving 25 doses per vial.
How sermorelin dosing math actually works
A sermorelin vial arrives as a freeze-dried (lyophilized) powder with a labeled mass — say 5 mg. Reconstituting it means adding bacteriostatic water, and how much you add sets the concentration: 5 mg dissolved in 2 mL is 2.5 mg/mL, while the same 5 mg in 1 mL is twice as concentrated at 5 mg/mL. The peptide mass never changes — only how much liquid each microgram is dissolved in.
From there the volume for a given dose is just division: a 200 mcg (0.2 mg) dose at 2.5 mg/mL is 0.08 mL. Because a U-100 insulin syringe is marked so that 100 units equal 1 mL, that 0.08 mL is 8 units — the number you actually line up against the barrel. A single 5 mg vial then yields 5 ÷ 0.2 = 25 such doses. The arithmetic is unforgiving in one direction: change the water and the units change too, which is exactly why it is worth checking rather than memorizing.
Sermorelin is also distinctive in when it is given. As a growth-hormone-releasing hormone analog, it is conventionally injected before bed on an empty stomach so its effect coincides with the body’s largest natural growth-hormone pulse during early deep sleep. The calculator surfaces that convention, but it does not set your schedule — your prescriber does.
Frequently asked
- How many units of sermorelin should I draw for my dose?
- It depends on your vial strength and how much bacteriostatic water you reconstituted with. As a worked example, a 5 mg vial reconstituted with 2 mL of water gives a 2.5 mg/mL concentration, so a 200 mcg dose is 0.08 mL, which is 8 units on a U-100 insulin syringe. Enter your own numbers above to see your figure, and confirm it against your prescriber and the product label.
- How is the U-100 unit count calculated?
- Concentration = vial mass (mg) ÷ bacteriostatic water (mL). The injection volume = dose (mg) ÷ concentration, where dose (mg) = dose (mcg) ÷ 1000. A U-100 insulin syringe holds 100 units per 1 mL, so units to draw = volume (mL) × 100. The tool shows every intermediate step so you can check the working.
- Why is sermorelin usually taken at night?
- Sermorelin is a growth-hormone-releasing hormone analog. It is conventionally injected before bed on an empty stomach so its effect lines up with the body's largest natural growth-hormone pulse, which occurs during early slow-wave sleep. This is a general convention, not personalized advice — your prescriber sets your actual schedule.
- Is this calculator medical advice?
- No. It performs unit arithmetic only and is not medical advice or a recommendation to use sermorelin. Sermorelin is prescription-only and typically compounded. Your dose, reconstitution, injection technique, and timing must be directed and supervised by a licensed clinician. Treat every figure here as something to verify against your prescriber and the product label.
Understand the context first
A number on a syringe is the easy part. What the evidence on sermorelin dosing actually shows, how to reconstitute and inject it correctly, and who should avoid it are what matter — read these before you draw anything:
This calculator is informational and not medical advice. It performs unit arithmetic only and does not account for your individual health, the specific product, injection technique, timing, or clinical appropriateness. Sermorelin is prescription-only after clinician review and is typically compounded. Talk to a licensed provider and confirm every figure against your prescriber and the product label before acting on any number here.