Breathe into better metabolic health

Lumen is the world’s first
handheld metabolic coach.

Lumen's research partners

65 million breaths and counting

Join the movement toward better metabolic health.

Breath Count Section Divider

Metabolism is life.
It's your body's engine, powering every process from your heartbeat to the steps you take. Lumen empowers you to transform your metabolism by balancing your lifestyle, so you can reach your health goals, from weight management to athletic performance to energy and longevity.

Join 300K+ Lumeners
changing their lives

12%

Up to 12% of body weight lost in just 6 months*

30%

Improvement in metabolic flexibility score*

3%

Body fat percentage lost on average in just 12 weeks**

As seen on

How it works

Get tailored guidance to improve your nutrition, exercise, sleep, and stress levels for a healthier you.

Innovative research,

groundbreaking applications

Lumen collaborates with top institutions worldwide to conduct game-changing research about metabolism.

Lumen is the top choice for doctors and clinics putting metabolic health first

Innovative, individualized, and data-driven solutions that empower both practitioners and patients to improve metabolic health.

Lumen Metabolism Data Enables Practitioners and Patients to Improve Metabolic Health.
FAQ

When your mitochondria use carbs as fuel, they release more CO₂ into your blood, and when they burn fat, they release less CO₂. Lumen analyzes the CO₂% in your breath and determines if you are using mostly fat or carbs for fuel based on the CO₂ concentration. 

Lumen’s technology is validated by multiple peer-reviewed scientific studies and is proven to measure metabolism as accurately as the gold-standard metabolic cart. Read the peer-reviewed paper.

Metabolic flexibility refers to how efficiently your mitochondria switch from burning carbs or fats for fuel, depending on their availability and your body’s needs. Being metabolically flexible can be critical for disease prevention and helps with managing weight, improved insulin sensitivity, higher energy levels, better sleep, and even longevity.

Yes, the Lumen device and app work together. The Lumen device measures your metabolism through your breath in real-time and the app provides personalized insights and lifestyle guidance based on those measurements. 

After adding your Lumen to the cart, select “HSA|FSA” as your checkout option, currently available only for annual or annual Duo memberships.

 

At checkout, Flex will prompt you to fill in a short health questionnaire to confirm your eligibility to pay with your HSA/FSA.

From there, enter your HSA/FSA card details and complete your checkout as usual.

If you don’t have an HSA/FSA card, you can complete the checkout with a regular credit or debit card, and Flex will provide you with an itemized receipt to submit for reimbursement.

Lumen is for anyone looking to improve their metabolic health, manage their weight, boost their energy levels, support their workout routine, and live happier and longer lives.

 

If you are under 16 years of age,  pregnant, or suffer from the following conditions, please consult a medical professional before using Lumen: 

Diabetes
Severe asthma
COPD

 

Additionally, Lumen's nutritional recommendations may not be suitable for people with:

Kidney disease
Cancer
Thyroid disorder

Yes, we offer a one-year warranty from the date the device is delivered to you. If your device or charging dock are damaged by manufacturing defects during that period, we'll fix or replace them free of charge. You can read our full warranty policy here.

* As reported in 2024 Lumen user data analysis 

** https://pubmed.ncbi.nlm.nih.gov/36195053/