Beta invitation

Welcome to the beta launch of the World's First Molecular Fitness Blood Test

Welcome to the beta launch of the World's First Molecular Fitness Blood Test

Uncover the biology driving your fitness, and what it means for your longevity and performance goals.

Uncover the biology driving your fitness, and what it means for your longevity and performance goals.

Learn from our CEO

Dr. Brooks Leitner, MD PhD

Reserve your test kit

Secure your spot in the beta launch

$199

Launch price $399

Launch price $399

Launch price $399

Self-collection blood sample kit

Prepaid return shipping

Comprehensive molecular lab analysis

Full report & insights

On-demand support from VO Health's scientists

Reserve for $1

Reserve for $1

Reserve for $1

Payment reserves your place on the waitlist. Your credit card will not be charged more than $1 until test kits are ready to ship.

What is Molecular Fitness?

Molecular Fitness is the real-time biological readout of your body's cardiorespiratory capacity measured by the proteins circulating in your blood right now.

Your blood proteome encodes the cumulative signal of every system involved in oxygen delivery and utilization: how actively your capillaries are growing, how efficiently your cells burn fat, how well your mitochondria are generating energy, and how effectively your body recovers from physical stress.

Your Molecular Fitness profile is uniquely yours.

Molecular Fitness is distinct from traditional fitness metrics because it is mechanistically grounded: each score is traceable to specific biological pathways, each pathway to specific proteins, and each protein to a known physiological function.

a bunch of beads that are in the shape of a snake

Precision Calibration

Calibrated against gold-standard VO₂ Max tests from thousands of people ages 18 to 80

person riding a mountain bike

Proteomics Technology

Built on cutting-edge proteomics technology exclusive to VO Health and select partners

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Built by Experts

Built by physician-scientists, data scientists, and human performance experts

Dive Deeper: Read VO's Scientific Thesis

What your results reveal

A complete picture of your biology — built from 50+ circulating proteins in the blood, unique to you.

A complete picture of your biology — built from 50+ circulating proteins in the blood, unique to you.

1

Molecular Fitness Score

A proprietary algorithm made of ~50 biologically-relevant proteins that estimates your cardiorespiratory fitness (blood-based estimate of VO₂ Max)

1

Molecular Fitness Score

A proprietary algorithm made of ~50 biologically-relevant proteins that estimates your cardiorespiratory fitness (blood-based estimate of VO₂ Max)

2

Molecular Fitness Pathways

An analysis of 10 unique molecular pathways that drive your VO₂ Max score and explain what may be contributing to your biological fitness.

2

Molecular Fitness Pathways

An analysis of 10 unique molecular pathways that drive your VO₂ Max score and explain what may be contributing to your biological fitness.

3

Healthspan & Performance Insights

How your Molecular VO₂ Max relates to long-term health outcomes and athletic performance goals.

3

Healthspan & Performance Insights

How your Molecular VO₂ Max relates to long-term health outcomes and athletic performance goals.

CEO explains

Dr. Brooks Leitner, MD PhD

Process and timeline

From order to insights — here's exactly what happens after you reserve your kit.

Watch how collection works

WEEK 0

Self collection kit arrives

Collection kit ships to your home or location of choice

WEEK 1

5-minute self-collection. Prepaid return envelope shipped to VO Health's lab.

three clear beakers placed on tabletop

WEEK 2-5

Samples batched and shipped for analysis at our technology partner's laboratory.

financial newspaper with stock chart

WEEK 4-8

Full molecular fitness report delivered to your inbox.

person in blue long sleeve shirt using black Surface

WEEK 8+

Meet with VO Health's health and performance scientists to help you understand your results.

RETEST

Recommended every 1, 3, or 6 months.

WEEK 0

Self collection kit arrives

Collection kit ships to your home or location of choice

WEEK 1

three clear beakers placed on tabletop

WEEK 2-5

financial newspaper with stock chart

WEEK 4-8

person in blue long sleeve shirt using black Surface

WEEK 8+

RETEST

WEEK 0

Self collection kit arrives

Collection kit ships to your home or location of choice

WEEK 1

5-minute self-collection. Prepaid return envelope shipped to VO Health's lab.

three clear beakers placed on tabletop

WEEK 2-5

Samples batched and shipped for analysis at our technology partner's laboratory.

financial newspaper with stock chart

WEEK 4-8

Full molecular fitness report delivered to your inbox.

person in blue long sleeve shirt using black Surface

WEEK 8+

Meet with VO Health's health and performance scientists to help you understand your results.

RETEST

Recommended every 1, 3, or 6 months.

Pricing

Be one of the first in the world to test your molecular fitness.

Have more questions?

Get in touch

Reserve your test kit

Secure your spot in the beta launch

$199

Launch price $399

Self-collection blood sample kit

Prepaid return shipping

Comprehensive molecular lab analysis

Full report & insights

On-demand support from VO Health's scientists

Reserve for $1

Reserve for $1

Reserve for $1

Payment reserves your place on the waitlist. Your credit card will not be charged more than $1 until test kits are ready to ship.

Frequently asked questions

When will I receive my results?

During our beta phase, results are delivered within 4–8 weeks of receiving your sample. We're actively optimizing our operations and expect to significantly reduce turnaround time in the coming months.

Does using the Tasso blood collection device hurt?

The Tasso device is designed for a comfortable, painless experience — most users feel little to nothing during collection.

How does this test compare to other VO₂ Max measurements?

Our test is the most accurate blood-based measure of VO₂ Max that currently exists. While grounded in gold-standard maximal VO₂ Max data, it measures fitness in a fundamentally new way, and we recommend that you treat it as its own unique lens rather than a direct comparison to a treadmill test or smartwatch.

How often should I retest?

We recommend testing at least 1–2 times per year, though you can retest as frequently as monthly to track changes in your fitness over time.

What if my score is different from my VO₂ Max exercise test and/or smartwatch estimate?

That's completely expected. This test measures proteins in your blood rather than cardiovascular output, so a direct comparison isn't the right frame. Think of it as a new dimension of fitness data — one that complements your other metrics rather than competing with them.

Is this test CLIA certified?

VO Health operates a CLIA-certified lab in New Haven, CT for clinical chemistry. This specific test is currently in beta and is not yet CLIA certified, but we are actively working toward certification and expect to achieve it by early 2027.

When will I receive my results?

During our beta phase, results are delivered within 4–8 weeks of receiving your sample. We're actively optimizing our operations and expect to significantly reduce turnaround time in the coming months.

Does using the Tasso blood collection device hurt?

The Tasso device is designed for a comfortable, painless experience — most users feel little to nothing during collection.

How does this test compare to other VO₂ Max measurements?

Our test is the most accurate blood-based measure of VO₂ Max that currently exists. While grounded in gold-standard maximal VO₂ Max data, it measures fitness in a fundamentally new way, and we recommend that you treat it as its own unique lens rather than a direct comparison to a treadmill test or smartwatch.

How often should I retest?

We recommend testing at least 1–2 times per year, though you can retest as frequently as monthly to track changes in your fitness over time.

What if my score is different from my VO₂ Max exercise test and/or smartwatch estimate?

That's completely expected. This test measures proteins in your blood rather than cardiovascular output, so a direct comparison isn't the right frame. Think of it as a new dimension of fitness data — one that complements your other metrics rather than competing with them.

Is this test CLIA certified?

VO Health operates a CLIA-certified lab in New Haven, CT for clinical chemistry. This specific test is currently in beta and is not yet CLIA certified, but we are actively working toward certification and expect to achieve it by early 2027.

When will I receive my results?

During our beta phase, results are delivered within 4–8 weeks of receiving your sample. We're actively optimizing our operations and expect to significantly reduce turnaround time in the coming months.

Does using the Tasso blood collection device hurt?

The Tasso device is designed for a comfortable, painless experience — most users feel little to nothing during collection.

How does this test compare to other VO₂ Max measurements?

Our test is the most accurate blood-based measure of VO₂ Max that currently exists. While grounded in gold-standard maximal VO₂ Max data, it measures fitness in a fundamentally new way, and we recommend that you treat it as its own unique lens rather than a direct comparison to a treadmill test or smartwatch.

How often should I retest?

We recommend testing at least 1–2 times per year, though you can retest as frequently as monthly to track changes in your fitness over time.

What if my score is different from my VO₂ Max exercise test and/or smartwatch estimate?

That's completely expected. This test measures proteins in your blood rather than cardiovascular output, so a direct comparison isn't the right frame. Think of it as a new dimension of fitness data — one that complements your other metrics rather than competing with them.

Is this test CLIA certified?

VO Health operates a CLIA-certified lab in New Haven, CT for clinical chemistry. This specific test is currently in beta and is not yet CLIA certified, but we are actively working toward certification and expect to achieve it by early 2027.