a woman breathing into her Lumen metabolism tracker connected the iphone

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.

Lumen 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.

Scientifically Validated

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

Trusted by the Pros

Like having your own personal nutritionist

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.
home atmosphere image of lumen metabolism tracker and results screen from the lumen mobile app

Customize your nutrition

Get daily personalized meal plans. Know exactly what to eat and when.
atmosphere image of women eating with lumen metabolism tracker and food recommendations mobile app screen from the lumen app

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.
atmosphere image of woman at the gym and the pre post workout results mobile app screen from the lumen mobile app

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.
atmosphere image of man breathing into the lumen metabolism tracker and the mobile app screen for the results of the metabolic flex score from the lumen app

From our community

Faster Than Before

Lumen partnered with Adidas Runners to improve runners metabolism and enhance performance.

Take the guesswork out of your nutrition