Vial duration

Epithalon vial duration calculator

Estimate how many weeks one 10 mg Epithalon 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

0.3 weeks

Epithalon weeks-of-supply at common cadences

How long one 10 mg Epithalon vial covers at a 5 mg per dose, for three weekly cadences. Total doses per vial: 2.

Doses per week	Total doses per vial	Weeks of supply
6	2	0.3
7	2	0.3
8	2	0.3

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 Epithalon vial lasts, the long version

Total doses in the vial: floor(10 ÷ 5) = 2. The floor matters — a partial dose at the bottom doesn't count.
Cadence: 7 doses per week for Epithalon at this example step.
Math weeks-of-supply: 2 ÷ 7 = 0.3 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 Epithalon

Math says one 10 mg Epithalon vial covers 0.3 weeks at 5 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

Epithalon next to NAD+

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

	Epithalon	NAD+
Vial	10 mg	100 mg
Cadence	7/wk	1/wk
Weeks of supply	0.3	2.0

Want the full breakdown? NAD+ reference →

Epithalon is a short four-amino-acid peptide people use in cycles, usually for sleep quality and as a longevity-adjacent experiment. The interest comes from research suggesting it can lengthen telomeres — the protective caps on the ends of chromosomes — and influence the pineal gland's melatonin rhythm. The original Russian trials reported telomere-length increases and improved sleep markers, but independent replication is limited. This page covers reconstitution math and how people log a typical 10–20 day cycle.

Planning Epithalon vials in real life

Epithalon is the highest-mg-load peptide most users run. A 10 mg vial covers 2 doses at the 5 mg daily step — that's 1 vial every 2 days. A standard 10-day cycle burns 5 vials; a 20-day cycle burns 10. Cycle-aware bulk ordering is essential because no one wants to rerun a half-completed cycle.

Stability never matters here because vials empty in days. The cycles themselves are short (10-20 days), the mg load per dose is high (5-10 mg), and the cadence is daily. Most Epithalon users order the entire cycle's vials at once and reconstitute one vial at a time as the previous one empties.

Storage and shelf life for Epithalon

Prior to reconstitution, vials of lyophilized Epithalon powder should be stored under refrigerated or frozen conditions to ensure long-term stability. Once the peptide has been dissolved in bacteriostatic water, the resulting solution is maintained in a refrigerator. The in-use vial is generally monitored over its use period of a few weeks for any changes in clarity or color.

How the Epithalon vial duration calculator works

A 10 mg Epithalon vial covers 2 doses at the 5 mg step — one vial per 2 days at daily cadence. A standard 10-day cycle uses 5 vials; a 20-day cycle uses 10. Stability isn't an issue because vials empty so quickly.

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 10 mg vial of Epithalon, a 5 mg dose, and 7 dose per week, the vial covers 2 doses, or about 0.3 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 Epithalon vial-planning mistakes

Reconstituting a 10 mg vial with 2 mL of diluent and not anticipating that a 5 mg dose requires drawing the full 100-unit capacity of a 1 mL syringe.

Frequently asked questions about Epithalon vial duration

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

It floors total doses (vial mg ÷ dose mg) then divides by doses per week. For this Epithalon example — a 10 mg vial, 5 mg per dose, 7 dose/week — that's floor(10 ÷ 5) ÷ 7 = about 0.3 weeks. Flooring matters: a partial dose left in the vial doesn't count. A 20-day Epithalon cycle at 5 mg daily uses 10 vials — order the full cycle in one batch.

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

Whichever runs out first. Math says Epithalon 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. A 20-day Epithalon cycle at 5 mg daily uses 10 vials — order the full cycle in one batch.

Does titrating the Epithalon 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. A 20-day Epithalon cycle at 5 mg daily uses 10 vials — order the full cycle in one batch.

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

Drop the doses-per-week field. With 7 dose/week the example vial lasts about 0.3 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. A 20-day Epithalon cycle at 5 mg daily uses 10 vials — order the full cycle in one batch.

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