Vial duration

Sermorelin vial duration calculator

Estimate how many weeks one 5 mg Sermorelin vial covers at your dose and weekly cadence.

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Last updated: May 13, 2026

Vial (mg)

Dose (mg)

Doses / week

Total doses

Lasts

3.6 weeks

Sermorelin weeks-of-supply at common cadences

How long one 5 mg Sermorelin vial covers at a 0.2 mg per dose, for three weekly cadences. Total doses per vial: 25.

Doses per week	Total doses per vial	Weeks of supply
6	25	4.2
7	25	3.6
8	25	3.1

Math weeks-of-supply assumes every dose draws cleanly. Stability typically caps a reconstituted vial at 4–6 weeks of refrigerated use regardless of how much liquid remains.

Worked example

How long one Sermorelin vial lasts, the long version

Total doses in the vial: floor(5 ÷ 0.2) = 25. The floor matters — a partial dose at the bottom doesn't count.
Cadence: 7 doses per week for Sermorelin at this example step.
Math weeks-of-supply: 25 ÷ 7 = 3.6 weeks of liquid in the vial.
Stability ceiling: most reconstituted peptides are typically used within 4–6 weeks of refrigerated storage. Whichever number is smaller is the one that binds your refill date.
Doubling the dose roughly halves both numbers — and titration usually closes the gap between "math weeks" and "stability weeks" without you noticing.

Scenarios people actually run into

Three things that come up logging Sermorelin

Math says one 5 mg Sermorelin vial covers 3.6 weeks at 0.2 mg per dose. Stability typically caps a reconstituted vial at 4–6 weeks. Whichever number is smaller is the date on your refill calendar.
Titration up doubles the dose and halves the vial. A 12-week-on-paper vial becomes a 6-week vial the day you step up — order the next vial the same day you take the step.
Shipping windows are the silent third constraint. If your supplier runs 1–3 weeks, the refill order has to leave at least that long before "math weeks" or "stability weeks," whichever is binding.

Same-category neighbor

Sermorelin next to GHRP-2

Both sit in the GH Secretagogue bucket — here's the vial duration math side by side on each one's example vial.

	Sermorelin	GHRP-2
Vial	5 mg	5 mg
Cadence	7/wk	7/wk
Weeks of supply	3.6	7.1

Want the full breakdown? GHRP-2 reference →

Sermorelin is a daily evening injection people use to bump up their own natural growth hormone production, usually for sleep quality, recovery, and skin and body-composition changes. It's a shortened version of the body's GHRH signal, so it nudges the pituitary instead of replacing GH from outside. Clinical studies in adults show modest but measurable IGF-1 increases over months of nightly use. This page covers reconstitution math and nightly logging cadence.

Planning Sermorelin vials in real life

Sermorelin is the cleanest vial-duration math in the GH-secretagogue family. A 5 mg vial covers 25 doses at 200 mcg, which is exactly one month at once-daily cadence. Order one vial per month, reconstitute the day you start, and the rhythm is automatic. No titration, no split doses, no stacking complications.

Stability gives a slim margin. The 4-6 week reconstituted vial window matches the 25-day usage almost perfectly — you'll finish a vial right around when stability would start to slip. Push past that with leftover doses and potency drops measurably. The cleanest pattern is 'one vial, one month, then start fresh' — which is also why sermorelin tends to attract the most disciplined GH-secretagogue users.

Storage and shelf life for Sermorelin

The unmixed, lyophilized peptide is stored under refrigeration to maintain its integrity prior to use. After reconstitution with a diluent like bacteriostatic water, the newly formed solution is also kept in a refrigerator. The in-use vial is typically monitored for clarity and is intended for use over a finite period, often outlined as several weeks in handling instructions from research suppliers.

How the Sermorelin vial duration calculator works

A 5 mg sermorelin vial covers 25 doses at 200 mcg. At once-daily that's 25 days — basically a month per vial. The 4-6 week stability window matches almost exactly, so plan one vial per month and you're set.

The formula is two divisions. Total doses per vial equals vial mg divided by dose mg, rounded down. Weeks of supply equals total doses divided by doses per week. With a 5 mg vial of Sermorelin, a 0.2 mg dose, and 7 dose per week, the vial covers 25 doses, or about 3.6 weeks of supply.

The three inputs that move the answer: vial mg (set when you bought the vial), dose mg (set by your protocol step), and doses-per-week (set by the peptide's half-life). Once a vial is reconstituted it also has a stability ceiling — most lyophilized peptides reconstituted in BAC water are typically used within four to six weeks of refrigerated storage, so a vial that mathematically lasts twelve weeks may not last twelve weeks in practice.

Common Sermorelin vial-planning mistakes

Mistaking its short half-life for a lack of activity and consequently attempting to use multi-day dosing intervals.
Dosing in the morning, which works against the body's natural GH circadian rhythm and the peptide's designed function.
Assuming it operates identically to longer-acting GHRH analogs and failing to maintain a rigid nightly administration schedule.

Frequently asked questions about Sermorelin vial duration

How does the Sermorelin vial duration calculator estimate weeks of supply?

It floors total doses (vial mg ÷ dose mg) then divides by doses per week. For this Sermorelin example — a 5 mg vial, 0.2 mg per dose, 7 dose/week — that's floor(5 ÷ 0.2) ÷ 7 = about 3.6 weeks. Flooring matters: a partial dose left in the vial doesn't count. Sermorelin and stability windows match almost perfectly at standard doses — set a calendar reminder for the 4-week mark.

Should I plan refills around the math, or around stability?

Whichever runs out first. Math says Sermorelin at the example dose lasts the calendar weeks shown above. Stability says most reconstituted peptides are typically used within 4–6 weeks of refrigerated storage regardless of how much liquid is left. If the math says 12 weeks but stability caps at 5, plan around 5 — and reconstitute the next vial with less water so you finish it in the stability window. Sermorelin and stability windows match almost perfectly at standard doses — set a calendar reminder for the 4-week mark.

Does titrating the Sermorelin dose up shorten vial life?

Yes, often dramatically. Doubling the dose halves the doses-per-vial. The calculator shows real-time how a step-up changes the weeks-of-supply line, so you can re-time refill orders before a titration event rather than discovering the gap mid-protocol. Sermorelin and stability windows match almost perfectly at standard doses — set a calendar reminder for the 4-week mark.

What if I take Sermorelin less often than the default cadence here?

Drop the doses-per-week field. With 7 dose/week the example vial lasts about 3.6 weeks; halving the cadence roughly doubles that, but you'll hit the stability ceiling first. A vial that mathematically covers 16 weeks rarely covers 16 weeks in practice. Sermorelin and stability windows match almost perfectly at standard doses — set a calendar reminder for the 4-week mark.

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