Including the studies that found nothingFree guidesProducts with the evidence attachedFree researchSlow down how fast you ageFree knowledge for everyone
Kratos Natural

Longevity

What aging actually is, and what a number measured off a body really predicts. The two abstract questions, together.

3 analyses

What is longevity? Meaning, causes and what helps

· 6 min read · 7 sources

What is longevity? Meaning, causes and what helps

The word gets used for two different things. Lifespan is how long you live; longevity, as this field uses it, is how many of those years you are well. What determines it, and what is actually proven.

Read article
Biological age: the real formula, not the questionnaire

· 8 min read · 4 sources

Biological age: the real formula, not the questionnaire

Calculate your biological age free from your own blood work, using the published formula. What it means, how to measure it, and what actually lowers it.

Read article
Which health tracker is accurate, and is it safe to wear one all day?

· 13 min read · 12 sources

Which health tracker is accurate, and is it safe to wear one all day?

Per measurement, from the validation studies, with what we would pick for each one. Plus the other half nobody asks: what a sensor strapped to your skin around the clock is actually doing to it.

Read article

Still to be written

Hallmarks of aging · Epigenetics · Senescence · Blood markers · Body composition · Self-tests

Guides

Bloodwork & testing

An artery in cross section, seen from the inside. Yellow plaque lies along both walls, and red blood cells push through the narrowing left between them.

Blood work: lipids

Your lipid panel has five or six numbers on it and they are not equally important. Which one carries the risk, which one is a message about something else, and how far diet and training actually move them.

Free

A glucose molecule as a ball-and-stick model: black carbon atoms in a ring, with red oxygen and white hydrogen around them, floating above a blue cell surface.

Blood work: blood sugar

Fasting glucose, HbA1c and insulin measure three different things and they disagree more often than anyone tells you. What each one sees, what it misses, and which of them a trial has ever moved.

Free

See all the research

Free longevity guide

Kratos Weekly lands in your inbox every Monday to start your week with: the latest analysis of that week's research, a recipe, a workout, a song with an explanation, a poem, and whatever else is worth passing on.

We store your email address to send the newsletter. Unsubscribe in one click, any time.