Up to 12 interest-free installments
| Over 3K reviews
Your metabolic health,
in your hands
Up to 12 interest-free installments
A Lumen device:
Membership includes:
Each Lumen device is crafted using top-tier manufacturing processes and undergoes rigorous testing to ensure quality.
The Lumen device uses a CO₂ sensor and flow meter to determine the CO₂ concentration in your breath, letting you know if you’re burning carbs or fats for energy in real-time.
Lumen’s unique technology has been validated to match the gold standard for metabolic measurement, giving you access to lab-level insights from your home.
The advanced lithium-ion polymer battery provides rapid charging, and lasts for ~10 days of use.
Compact, but powerful. Lumen fits in your hand, pocket, or handbag - ensuring effortless measurements anytime, anywhere.
Form meets function with Lumen’s minimalist aesthetic and ergonomic design, made with high-quality materials to a top-tier standard.
Members get daily personalized guidance and insights for reaching their health goals
Real-time insights into your body’s energy source. Know if your body is burning fats or carbs and get daily guidance on how to reach your health goals.
See how your lifestyle habits impact you today. Learn what works for your body with nutrition, exercise, sleep and stress and make better choices.
Know what to eat and when.
Lumen learns your body and gives you a daily personalized plan to know what to eat.
Make on-the-spot decisions.
Measure before your workouts to see whether you have enough fuel and after to see the impact.
Learn more on your journey.
Find science-backed coaching videos with actionable tips to help you understand more about metabolic health.
Reveal your metabolism's efficiency. Lumen measures your metabolic health and provides you with a score to reflect it.
Connect to your favorite health & workout apps. Frictionless integrations with Apple Health, Google Fit, and Garmin.
Sync your nutrition to your monthly cycle. Find personalized recommendations for each day of your phase suited for your physiology.
Real-time insights into your body’s energy source. Know if your body is burning fats or carbs and get daily guidance on how to reach your health goals.
See how your lifestyle habits impact you today. Learn what works for your body with nutrition, exercise, sleep and stress and make better choices.
Know what to eat and when.
Lumen learns your body and gives you a daily personalized plan to know what to eat.
Make on-the-spot decisions.
Measure before your workouts to see whether you have enough fuel and after to see the impact.
Learn more on your journey.
Find science-backed coaching videos with actionable tips to help you understand more about metabolic health.
Reveal your metabolism's efficiency. Lumen measures your metabolic health and provides you with a score to reflect it.
Connect to your favorite health & workout apps. Frictionless integrations with Apple Health, Google Fit, and Garmin.
Sync your nutrition to your monthly cycle. Find personalized recommendations for each day of your phase suited for your physiology.
"I've lost over 18lbs with Lumen and it's keeps my consumption in check. I'm no longer aimlessly working out, nearly starving, or eating bland food in hopes of losing weight.
Lumen guides me in the right direction and with it, I have surpassed my weight loss goals. I've never been more healthy, fit, and proud. Lumen is a game-changer."
"I had lost all hope to lose weight; had tried many different diets and nothing worked until I became a Lumen user. I am losing weight YAY!
And not tied to a diet that requires specific ingredients and most of the time expensive stuff. With Lumen I eat what I like and when I want it; I try to follow their macro recommendations; it is great not to feel restricted, Lumen gave me hope."
“It’s great for understanding how your metabolism reacts to all kinds of stimuli like diet, exercise, stress, alcohol, or just overeating.
It helped me understand how important it is not to eat past 7 PM so your body can digest your last meal and switch to burning fat during sleep. Really helped me to stop snacking at night.”
"The Lumen is an easy habit to get into if you want to know and improve your metabolism
It provides feedback to help get on right track for when and what to eat, tracking metabolism, fasting and macros. It incorporates a food and exercise log and adjusts your macros based on exercise."
"The specialized system is beyond amazing. I see results and the education aspect has helped me understand MY habits.
I would definitely recommend everyone that has struggled to break the habit of the so called latest and greatest weigh loss trend to get a Lumen. Lumen is a personalized device that measures YOU and is not some general guide for everyone"
"Lumen has been a key player in helping me take my health to the next level. I love the insight it gives me in real time so I never ever guess if I'm making the right decisions with my meal timings, portions, macro split, workout timings or intensity, etc.
I've been able to decrease my coffee intake significantly (by the cup stregth and by the week!), increase my lean muscle definition, build and maintain lean muscle mass, reduce body fat, improve my skin, and so much more!"
"I've lost over 18lbs with Lumen and it's keeps my consumption in check. I'm no longer aimlessly working out, nearly starving, or eating bland food in hopes of losing weight.
Lumen guides me in the right direction and with it, I have surpassed my weight loss goals. I've never been more healthy, fit, and proud. Lumen is a game-changer."
"I had lost all hope to lose weight; had tried many different diets and nothing worked until I became a Lumen user. I am losing weight YAY!
And not tied to a diet that requires specific ingredients and most of the time expensive stuff. With Lumen I eat what I like and when I want it; I try to follow their macro recommendations; it is great not to feel restricted, Lumen gave me hope."
“It’s great for understanding how your metabolism reacts to all kinds of stimuli like diet, exercise, stress, alcohol, or just overeating.
It helped me understand how important it is not to eat past 7 PM so your body can digest your last meal and switch to burning fat during sleep. Really helped me to stop snacking at night.”
"The Lumen is an easy habit to get into if you want to know and improve your metabolism
It provides feedback to help get on right track for when and what to eat, tracking metabolism, fasting and macros. It incorporates a food and exercise log and adjusts your macros based on exercise."
"The specialized system is beyond amazing. I see results and the education aspect has helped me understand MY habits.
I would definitely recommend everyone that has struggled to break the habit of the so called latest and greatest weigh loss trend to get a Lumen. Lumen is a personalized device that measures YOU and is not some general guide for everyone"
"Lumen has been a key player in helping me take my health to the next level. I love the insight it gives me in real time so I never ever guess if I'm making the right decisions with my meal timings, portions, macro split, workout timings or intensity, etc.
I've been able to decrease my coffee intake significantly (by the cup stregth and by the week!), increase my lean muscle definition, build and maintain lean muscle mass, reduce body fat, improve my skin, and so much more!"
Before Lumen, assessing your metabolic health required a lengthy procedure using a metabolic cart, costing hundreds of dollars
...for a single, detailed professional-grade metabolic measurement.
Lumen's handheld device meets the gold standard. Unlimited measurements can be taken anytime and anywhere.
...With each breath measurement, Lumen’s advanced algorithm builds a personalized diet plan and lifestyle recommendations based on your real-time results.
Before Lumen, understanding your metabolic health meant spending 40 minutes and paying hundreds of dollars for a single detailed, professional-grade metabolic measurement.
Lumen's handheld device meets the gold standard. Unlimited measurements can be taken anytime and anywhere.
With each breath measurement, Lumen’s advanced algorithm builds a personalized diet plan and lifestyle recommendations based on your real-time results.
I lost 4lb the first week and 2lb the second...but more importantly, I was no longer sleeping badly or tempted to have a nap at 4pm.
You could hire an expensive coach or you could hack your health with Lumen.
Breathe into it and the Lumen will tell you how well you're burning fat, and how to eat healthier.
This Smart Gadget Helps You Hack Your Metabolism And Lose Weight.
What once took over an hour to measure, and a team of nutritionists and scientists to analyze, can now be done in less than three minutes.
I lost 50lbs in seven months by changing one thing about my routine - Lumen
As a nurse and a woman who has struggled with weight loss…trying Lumen was eye-opening and validating.
To get a metabolic reading in the past, you had to go to a lab. Now you can keep it in your purse or gym bag.
Cleverly, all you have to do is breathe into the handheld device (which is small enough to fit in even the smallest handbags).
I lost 4lb the first week and 2lb the second...but more importantly, I was no longer sleeping badly or tempted to have a nap at 4pm.
You could hire an expensive coach or you could hack your health with Lumen.
Breathe into it and the Lumen will tell you how well you're burning fat, and how to eat healthier.
This Smart Gadget Helps You Hack Your Metabolism And Lose Weight.
What once took over an hour to measure, and a team of nutritionists and scientists to analyze, can now be done in less than three minutes.
I lost 50lbs in seven months by changing one thing about my routine - Lumen
As a nurse and a woman who has struggled with weight loss…trying Lumen was eye-opening and validating.
To get a metabolic reading in the past, you had to go to a lab. Now you can keep it in your purse or gym bag.
Cleverly, all you have to do is breathe into the handheld device (which is small enough to fit in even the smallest handbags).
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 important for disease prevention and helps with managing weight, improved insulin sensitivity, higher energy levels, better sleep, and even longevity.
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 has been validated to match the gold standard for metabolic measurement with an at-home, handheld device.
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.
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.
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.
Yes, you can cancel your membership at any time. Cancellations will take effect on the next billing cycle.
Your membership will start when you activate your account after receiving your Lumen device, or 10 days after your purchase, whichever is earlier.
Yes, for Lumen devices purchased starting July 30th, 2023, after the cancellation comes into effect you’ll still be able to take unlimited metabolic measurements. However, you won’t have access to the Lumen membership experience, including granular results, measurement history, personalized insights and tailored guidance.
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 suited for people with:
Kidney disease
Cancer
Thyroid disorder
For other medical problems, please check with your doctor first.
Lumen is under warranty for one year, starting from the date of account activation, or 10 days after your purchase, whichever is earlier. If your device or charging dock develop a fault caused by manufacturing defects during that period, we'll fix or replace them free of charge. You can read our full warranty policy here.
Your Lumen can be returned for a full refund within 30 days of receiving it, if it is unopened. We want you to be satisfied with your Lumen, so please reach out to Customer Support if you’re having problems. Read our full refund policy.