Your metabolism powers everything that happens in your body. By training it to be more flexible, and switch more easily between burning carbs and fat, you can improve many aspects of your well being. From work-outs and weight loss to sleep and longevity.

A more flexible metabolism makes it easier to lose weight, with Lumen you'll train your body to switch more easily from burning carbs to fat. Many users find this helps them with weight loss. Additionally if you select a weight loss track in the Lumen app, Lumen designs your nutrition plan in a way that supports healthy and sustainable weight loss.

In the past, the only way to get a single "gold standard" measurement was to spend 45 minutes lying very still in a specialist lab, connected to equipment, these tests cost up to $350+ per a single measurement. With Lumen you have the same tech at your fingertips and can measure your metabolism from the comfort of home, in minutes not hours and for the first time with a personalized daily plan to not only measure but also reach your health and wellness goals.

Reaching a state of ketosis usually requires extended deprivation from consuming carbohydrates. Lumens methodology isn't about cutting out carbs but rather incorporating healthy carb rich foods into your diet, while training your body to shift more efficiently between using carbs and fats as a fuel source and maintaining a healthy state of fat burn.

For more info read this article on the subject.

Lumen provides valuable insights for those switching between carbohydrate and fat burning, but in ketosis, the presence of ketones complicates the readings and you may not see a clear indication of being in fat-burn when taking measurements. The higher CO₂ levels from ketone metabolism can suggest carbohydrate use, even when you're mainly relying on fats for energy.

Yes. Lumen has been validated in multiple studies as well as peer-reviewed and scientifically proven to be as accurate as the gold standard for measuring Respiratory Exchange Rate (RER) . 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 is the only way to measure your metabolism in real-time to receive personalized insights and guidance in the Lumen app.

Yes, you can cancel your membership at any time you wish.

The membership cancellation will come into 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 and get your Lumen level. However, you won’t have access to the Lumen membership experience, including granular results, measurement history, personalized insights and tailored guidance.

Your Lumen can be returned for a full refund within 30 days of receiving it, if it is unopened. We want you to be completely satisfied with your Lumen. So please reach out to Customer Support if you’re having problems. Read our full refund policy.

One year. So if your device or charging dock develop a fault caused by manufacturing defects within 12 months of purchase, we'll fix or replace them free of charge. Accidental damage is not covered. Read our full warranty policy.

We created Lumen to help people above the age of 16, improve their metabolic flexibility so they can enjoy better work-outs, improved sleep, easier weight loss and happier, longer lives. however there are certain conditions and diseases which can impact the Lumen results and therefore we do not recommended Lumen for people with the following:

‍Who should not use Lumen? ‍Conditions affecting the measurements:

• Diabetes
• Severe asthma
• COPD
• Pregnancy / breastfeeding

‍Additionally Lumens nutritional recommendations may not be suited for people with:

• Kidney disease
• Cancer
• Thyroid disorder

‍For other medical problems, please check with your doctor first.