The first device to
hack your metabolism

Lumen knows if your body is using fats or carbs for fuel


Optimize Workouts    Get The Right Nutrition    Lose Weight


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It starts with a breath

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.

Unlock your metabolism

The CO2 concentration is measured using a unique breath maneuver, which is performed by inhaling a fixed volume of air through the Lumen device (dynamic to each individual), holding it for 10 seconds, and exhaling fully.

Real-time accuracy

Lumen’s technology has been scientifically proven to accurately measure metabolic fuel usage when compared to the gold standard (RER) for measuring metabolism in multiple validation studies.

Lumen exhibits similar trends to the Gold Standard when measuring changes in metabolic fuel.

Metabolic flexibility

With Lumen’s daily insights, you will improve your metabolism by improving metabolic flexibility: your body’s ability to shift efficiently between using fats or carbs as a source of energy.

Getting to know you

Lumen is calibrated to your unique CO2 range and lung capacity.

Taking a morning breath

Each morning, Lumen determines the source of your body’s fuel — carbs or fats.

Receiving your plan

Lumen provides personalized nutrition recommendations and daily guidance on sleep, diet, exercise and more.