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Longevity as a service.

Your body's data, synchronized.

Wearables, labs, sleep, meals, movement — one spine.

Wearables Labs Sleep Meals Movement One spine

Pursue reverse aging.

Biological age, pace, and the markers you can watch.

The science already exists. What used to be million-dollar protocols — we apply it.

Everyone can have that stack. Regular people. Not a researcher. Not a doctor. A participant, not a patient.

The method

One proven change. Eight to twelve weeks. Your data decides.

  1. 01

    Cite

    The study already ran. We name it. Guessing is the time sink.

  2. 02

    Apply

    One change, eight to twelve weeks, in the life you already have.

  3. 03

    Decide

    Your data says whether it held. Why wouldn't you?

One change, from week one Your data decides. 1 4 8 12
Weeks eight to twelve are the verdict window — the honest length for an n=1. Ours by design, not borrowed from a paper.

Sleep · Volume 33 · 2010

Sleep duration and all-cause mortality: a systematic review and meta-analysis of prospective studies

Cappuccio · D'Elia · Strazzullo · Miller

1,382,999 adults · 16 prospective cohorts

A meta-analysis of 1.4 million adults found sleeping under six hours associates with 12% higher all-cause mortality.
Cappuccio et al. 2010 — Sleep

Protect a full sleep window — seven to nine hours.

Run it for eight to twelve weeks. Your data decides if it moved you.

The eight-to-twelve-week window is ours, not the paper's — the honest length for an n=1 to speak.

All-cause mortality, hazard ratio reference — least-active quartile 1.0 0.5 0 0 4,000 8,000 12,000 Median daily steps, by cohort quartile 0.47
Paluch et al. 2022 — Lancet Public Health 47,471 adults · 15 cohorts · median 7.1 years of follow-up Illustrative of the paper — drawn from its published quartile medians and hazard ratios. Axes start at zero.

The benefit rises steeply, then plateaus — six to eight thousand steps a day for older adults, eight to ten for younger. Ten thousand was a pedometer slogan, not a finding.

The membership

Why wouldn't you?

$99/year

for founding 100 members

Kosei is wellness and self-tracking — not a medical device or a substitute for a clinician.

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$99/year for founding 100 members.

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