The metabolic layer
for your patients
A companion patients use every day - and the data layer that enables your clinic to support them between visits. More engagement, clearer progress, stronger retention - across any program.
Backed by researchers at the world's leading institutions
Lumen is the world's first handheld metabolic
measurement device
Each morning, your patient sees whether their body is burning fat or carbs, and receives personalized insights and recommendations. The same data flows to your clinic.
For the patient
A reason to stay engaged
Early proof the program
is working
Within days, patients see their fuel use shift — feedback that arrives long before their next appointment.
A personalized plan built
for each day
Each morning's fat-or-carbs reading drives that day's nutrition, activity, and meal timing.
Behavioral change that creates
lasting habits
Fuel awareness, meal timing, movement — the habits that sustain results long term.
For the clinician
Visibility between visits
Monitor and optimize patients'
outcomes remotely
Stay connected to your patients' progress, helping you to provide ongoing support.
Drive better results with
patient accountability
Help clients stay committed with in-depth metabolic insights that promote long-lasting habits and lifestyle change.
Increase program lifetime value
and revenue
Drive growth, increase memberships, and boost long-term engagement by integrating Lumen to sustain positive outcomes.
40+ integrations
Sync Lumen with your favorite health apps and wearables for a seamless, data-driven experience.
Built for any program
Weight loss
Daily fuel data and adaptive nutrition guidance that reduce plateaus and support steady, sustainable progress.
GLP-1 programs
Daily guidance supports adequate fueling, muscle preservation, and habits that support lasting weight loss.
Women's health
Metabolism shifts across menstrual phases and menopause. Lumen's breath data reflects those hormone-driven changes, so guidance matches the body as it is now.
Longevity
Metabolic flexibility is a marker worth tracking over decades. Lumen gives your patients a daily readout and your clinic a long-term trend line.
Engaged patients get better results
Lumen provides patients with a reason to stay engaged daily, resulting in:
45%
of Lumen users lost more than
10% of their body weight¹
30%
Improvement in patients'
metabolic flexibility²
85%
of Lumen users feel more
confident about nutrition³
How Lumen works with your program
Lumen provides all the onboarding and support so you can do what you do best - focus on taking care of your patients.
Ready to use
out-of-the-box device
The Lumen device helps users understand their bodies, what to eat, and when according to their real-time metabolic rate.
Real-time metabolic data
for you and your patients
View real-time metabolic data and gain deeper insights into patients' nutritional health.
A 360° view in one
monthly report
The monthly report combines Lumen data with your patients' apps and wearables to show you the full picture.
Durable outcomes fueled
by behavioral change
Daily engagement results in better adherence, clearer progress, and stronger retention.
Trusted by doctors
Innovative research, groundbreaking applications
Validation study
Lumen's measurement accuracy was validated in a peer-reviewed study, establishing Lumen's accuracy to be on par with the gold standard (RER) for metabolic measurements.
Prediabetes research
Prediabetes participants using the Lumen device for 12 weeks achieved weight loss as well as reduced body fat, HbA1c, waist circumference, systolic blood pressure, and triglycerides.
Lumen's fasting study
This research revealed that Lumen's sensitivity to variations in carb intake, fasting duration, BMI, and gender enables it to account for individual differences and assist users in optimizing their fasting routines.
Women's health research
Lumen's study revealed that women burn more carbs in the follicular phase and more fats in the luteal phase. Moreover, menopausal women on hormone replacement therapy (HRT) wake up burning more fat compared to women not on HRT.
See how Lumen can increase
your patient lifetime value
Added lifetime value per patient
$5,250
Illustrative estimate, based on an average patient lifetime of 27 months with Lumen.
Lumen is a wellness product, not a medical device.
Ready to transform
your clinic?
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, breastfeeding, 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.
¹Cross-sectional study of 828 Lumen users
²Retrospective analysis of 7,200 Lumen users on GLP-1s
³Community survey of 2,000 Lumen users
How do I get Lumen
for my clinic?
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