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It starts with a breath

Lumen is the world’s first hand-held, portable device to accurately measure metabolism.
Lumen is the world’s first hand-held, portable device to accurately measure metabolism.
Once available only to top athletes, in hospitals and clinics, metabolic testing is now available to everyone.

The science isn’t new, but the technology is.

The Lumen device uses a CO2 sensor and flow meter to determine the CO2 concentration in a single breath. This indicates the type of fuel your body is using to produce energy.
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Scientifically Validated

Lumen has been scientifically proven to meet the the gold standard of metabolism measurement (RER) in multiple validation studies.

Like having a nutritionist in your pocket

Know what and when to eat to fuel your workout, improve your metabolic flexibility and support fat burn.

Track your
metabolism daily

See how your metabolism is affected by your sleep, physical activity, and nutrition.

Customize your nutrition

Get daily personalized meal plans. Know exactly what to eat and when.

Workout optimization

See if you have enough energy before a workout or if you need to fuel up. Breathe afterwards to see the impact on your body.

Monitor and improve your metabolic health

Over time, Lumen tracks your metabolism, sleep, nutrition, and fitness data to provide a Lumen Flex Score, which reflects your success and helps sustain results.

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