Lumen is a new product that measures your metabolism in real time. It provides personalized nutrition plans to master your weight loss and performance goals.
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Is Lumen Inc legit?
Lumen Inc (www.lumen.me) has a 4.2 out of 5 rating on OK.one, based on 175 user reviews collected here. It is listed under Beauty & Well-being and its reputation is good. 79% of reviews are 4 stars or higher and 14% are 1 star; The business has replied to 100% of negative reviews; Reviews mostly discuss Product, User experience, App. Last updated 2026-09-05.
What reviewers say
AI generated
Reviewers overwhelmingly had a great experience with this company. Customers praise the device for making it easy to track metabolism, monitor fat and carb burn, and stay motivated on their wellness journey. Reviewers frequently mention that the app and daily breath measurements provide insightful guidance for improving nutrition and supporting overall health.
However, some people mentioned difficulties with the app, noting that barcode scanning for meals can be limited and custom recipes are hard to enter correctly. A few other people also felt that customer support could sometimes be difficult to reach or slow to resolve technical and account issues.
Auto-generated from all reviews of this business. For reference only.
Edited ***. I did finally get ahold of someone in customer service who went above and beyond to help me figure this all out! They found out there was a typo on my email which threw everything out of wack and fixed the issue very quickly after that! Highly recommended the product itself! They advertise this product as being able to be paid for with your HSA funds, however when I placed my order, chose the option to pay with HSA, ( a separate processing company-withflex) I did not receive confirmation of purchase, a shipping notification, a welcome email, nothing. I had to contact their support department to get all these things…. Then the trouble began. My HSA required a medically necessary letter, upon which I reached out to their support team again and was told I should have received an email from withflex, as I chose that option. They said they can’t retroactively produce the questionnaire that I need so to contact this processing company. So I did that. The processing company Withflex, denies billing me, even after providing proof of the purchase from my HSA.
Reply from Lumen Inc2026-01-23
Hi Shannon,
Thank you for taking the time to share this and we are truly sorry for this experience.
After reviewing your account, I can see that there was a typo in the email address entered at checkout, which is why you didn’t initially receive the confirmation, shipping, and welcome emails.
We also work closely with Flex as a third-party processor, and while certain steps, such as medical necessity questionnaires must be handled directly through them, we’re committed to supporting you and coordinating where possible to help resolve this.
That said, I can see that you’re currently already working with a member from our team, and we are dedicated to resolving this.
All the best,
The Lumen Team
The way it drives my through the process is very gentle, kind and well explained
Reply from Lumen Inc2026-01-22
Hi Ben,
Thank you for the 5-star review!
We’re happy to hear that you're enjoying your Lumen journey. Keep up the great work :)
All the best,
The Lumen Team
Great customer service. Fast response on a small issue I had. I'm looking forward to the future with my Lumen.
Reply from Lumen Inc2026-01-20
Hi Rob,
Thank you for the 5-star review!
We’re glad we could help resolve your issue quickly. We truly appreciate your support and are excited to have you as part of the Lumen community. Wishing you all the best on your Lumen journey :)
All the best,
The Lumen Team
I bought a Lumen years ago and now they automatically charged me $300. The product didn't work for me. I didn't sign up for continued use & this is years later. I upgraded the review from 1 star to 3 stars. After my review, they did refund my money. Very glad they responded to my review. I had already sent a support ticket but didn't get a response until I posted this review. No explanation as to why this happened. The good news, I got my money back. Thanks!!!
Reply from Lumen Inc2026-01-20
Hi there,
Thank you for bringing this to our attention, and we’re truly sorry to hear about your experience.
Unfortunately, we cannot locate your contact details using the information provided on TrustPilot. We have submitted a request for your information and look forward to speaking with you. Our Customer Experience team is dedicated to looking into this further to understand what happened and to assist you with your membership.
All the best,
The Lumen Team
This device is amazing! You can still enjoy the food you love with less carbs and truly see positive weight loss and results!
Reply from Lumen Inc2026-01-20
Hi Obi,
Thank you for the 5-star review!
We’re so happy to hear that you're enjoying the insights Lumen is providing you. Keep up the great work :)
All the best,
The Lumen Team
This product is the total package. I had know idea you provided diet recommendations to pair with your daily levels. I am completely satisfied with everything about the Lumen.
Reply from Lumen Inc2026-01-16
Hi Delaner,
Thank you for the 5-star review!
We're so glad to hear that you're loving your Lumen. Keep up the great work :)
All the best,
The Lumen Team
I love my Lumen and I want to keep using it to hack my metabolism 🙃
Reply from Lumen Inc2026-01-15
Hi Sara,
Thank you for the 5-star review!
We’re happy to hear that you're enjoying your Lumen journey. Keep up the great work :)
All the best,
The Lumen Team
This review has nothing to do with the product itself but the customer support. My lumen device was stolen and the AI told me to contact support by putting in a ticket. I submitted at ticket for assistance so that I could replace the device on 1/5/2026 today is 1/12/2026 and I have still not received a response other than the automatic reply that tells me not to submit another ticket. I haven't had the device for long less than 6 months and for the money that I spent on the year long subscription and not be able to use it is very bad experience.
Reply from Lumen Inc2026-01-13
Hi Robert,
Thank you for bringing this to our attention, and we’re truly sorry to hear about your experience.
Unfortunately, we cannot locate your contact details using the information provided on TrustPilot or the ticket inquiry you submitted. We have submitted a request for your information and look forward to speaking with you. Our Customer Experience team is committed to assisting you and ensuring you get back up and running with a replacement Lumen device.
All the best,
The Lumen Team
The explanations are great. They just added an additional feature to assist uses with focus. There is a wealth of information available. Just seeing what ny body is doing is helping me be much more mindful & feeds my motivation.
Things I dont like. I am having issues linking my other apps (use Zepp for my watch). It seems to assume my morning breath means I have stopped fasting; though I dont think it did that initially.
Reply from Lumen Inc2026-01-13
Hi Tammy,
Thank you for the awesome review!
We're so happy to hear that you are enjoying the insights Lumen is providing you. Keep up the great work :)
To ensure the overnight fasting tracker continues after taking your morning breath, it’s important to follow the prompts after receiving your morning breath results. If you do not choose to continue the fast, the overnight fasting tracker will automatically end the fasting period after the morning breath measurement.
While we currently don’t have a direct integration with Zepp, you can sync your data through Google Fit or Apple Health, which will then sync with Lumen.
Feel free to reach out to our support team via the in-app chat or via email at [email protected], and our support team will be happy to help you set up your integration and the overnight fasting tracker.
All the best,
The Lumen Team
I'm a relatively new user, so I can't speak to long term use of the product. But I'm very happy with it and the results I'm getting in the first few weeks. I do see, however, that there are a lot of complaints about the company's customer service. So far I haven't had to deal with any issues.
Reply from Lumen Inc2026-01-12
Hi Tanya,
Thank you for the 5-star review!
We're glad to hear you're loving your Lumen journey so far. If you do need any assistance in the future, we're always here to help through the in-app chat or email at [email protected]. Keep up the great work :)
All the best,
The Lumen Team
Extremely fast shipping! Although I paid the additional shipping cost to have it sooner. Was incredibly easy to purchase. There are however some very mixed reviews on the product itself. I received the device and had to charge it before it would even turn on which is unusual. Then the tutorial to learn to use it is simplistic. I completed it, then was not able to figure out how to go back and do it again. Consequently, I have many errors when I am trying to take a breath and have to retry multiple times to get it done. The device itself is exceptional, the application and the software are pretty atrocious. For instance, I am on Keto, so when I saw that as an option in the app, I was pleased. When I looked into it deeper it calculates nearly double the carbs that I am willing to ingest daily and there is no way to really change that in the master list. I can adjust the carb count down, but I MUST assign 96 carbs to the different meals of the day. I only eat less than 50 carb per day and have kept myself in Ketosis for months at a time and dropped nearly 100lbs. When I slowed introduced carbs back into my diet I gained weight, so I have no interest in going backward and 95 grams of carbs is not going to happen. There is no way to delete a breath(that I have found yet). I am not sure that this will work for me, but I am still early in the process. I'll follow up as things progress
Reply from Lumen Inc2026-01-09
Hi Jeff,
Thank you for taking the time to share such detailed feedback.
Lumen devices are not shipped fully charged, so it’s normal for the battery to need charging when it arrives. We recommend fully charging it before your first use to ensure the best experience.
If you’re experiencing difficulty with taking a successful breath measurement, we recommend reaching out to our support team, who can review your data on the back end and help you get up and running.
Regarding our Keto setting, it was designed to help Lumeners just like you transition from a carnivore or keto diet to a more balanced style of nutritional intake. Although the carb recommendations provided with this setting applied won’t be as low as those from a strict keto diet, they will be lower than the standard Lumen recommendations you’d receive. The Keto setting will allow you to manage your intake in your preferred style while simultaneously supporting improvements in your metabolic flexibility and supporting energy needs appropriately!
We appreciate you giving it some more time as you continue using it and please don’t hesitate to reach out to our support team via email at [email protected] or via the in-app chat, and our team will be happy to assist you with the breathing, current carb recommendations and any additional questions you may have.
All the best,
The Lumen Team
I love the app, it gives guidance and insight that help me make better decisions.
Reply from Lumen Inc2026-01-07
Hi Georgette,
Thank you for the 5-star review!
We’re so happy to hear that you're enjoying the insights Lumen is providing you. Keep up the great work :)
All the best,
The Lumen Team
I ordered this device with the lifetime membership just before Christmas and it shipped quickly. That’s where the positive experience ended. The device has never been delivered. The FedEx tracking shows that it arrived in the Miami destination sort facility on 12/26, but it’s never moved from there. On Friday January 2nd, I sent Lumen an email asking for an explanation, since FedEx only deals with the shipper on a product like this. Lumen responded and said they were inquiring about it, and then just went radio silent. I waited all day on Friday, nothing. I sent a follow-up email knowing they’d surely see it first thing Monday morning and respond, but again, no response.
So now I’ve instructed Lumen to issue me a full refund. By ignoring my customer service inquiry and not ensuring that the delivery issue was resolved quickly, Lumen has lost a customer.
Reply from Lumen Inc2026-01-06
Thank you for your feedback.
We’re very sorry for your experience and understand how frustrating this situation has been, especially around the holidays. We sincerely apologize for the delay in communication and the delivery issue with FedEx. Our team has been handling a high volume of inquiries along with irregular hours due to the holidays. Even though we are still working with FedEx on locating the shipment, I see that our team did offer to ship another device to you. We hope you give Lumen another try in the future.
All the best,
The Lumen Team
This tool makes it easy to see how and when your body is burning fat. Game changer- now you don’t have to guess at when the pounds will start dropping!
Reply from Lumen Inc2026-01-06
Thank you for the 5-star review!
We’re thrilled to hear the Lumen has been a game-changer for you. Keep up the great work :)
All the best,
The Lumen Team
Lumen does not allow returns - at all - because they know that this product does not work for everyone and want to keep the consumer's money!!!! Most products offer a 30-day return period so I decided to try the product. 1st con- I'm on a keto diet and Lumen doesn't give accurate readings for people following a keto or carnivore diet. 2nd con- you need to pay for a subscription to their app after the first 30 days to get the most use out of the product. Well, not me because the readings are going to say I'm burning carb when really burning fat for fuel. So, I wasted my money and I came to this site before buying. I hope this review helps someone to not make the same mistake I made. Amazon has keto breath meters for $80.00.
Reply from Lumen Inc2026-01-06
Hi Dee,
Thank you for your feedback.
Our goal is for everyone to have a positive experience using Lumen, and we try to be as transparent as possible when it comes to our policies and how Lumen is used. The return policy can be found in the FAQ, Checkout page, and Terms of Use on our website. Similarly, the information about Lumen and keto is readily available on our website in our Help Center and FAQ.
We're always here to help if you decide to give Lumen another try in the future.
All the best,
The Lumen Team
Great product but battery life deteriorates after a few months
Reply from Lumen Inc2026-01-02
Hi Mark,
Thank you for the great review!
We're happy to hear that you're loving your Lumen. The battery should be expected to last at least 8-10 measurements on a single charge. We would recommend making sure you're using a valid charging setup for the best results. This includes using the USB-C to USB-A cable that comes with your device with a charger brick that is no more than 5V. Please also avoid multiport chargers and surge protectors.
Please let us know if you have any other questions and keep up the great work :)
All the best,
The Lumen Team
The company intentionally and deceptively places of the return policy below the make purchase button so that it is completely out of view and you are not having to manually acknowledge any policy. The purchase is an automatic acceptance of their T&C, refund policy, return policy and cancellations.
So, please scroll down past the make purchase button to review those. It’s not even visible to that page you have to scroll down.
They really should be sued for this deceptive practice and placement. They also do not have a process for proper disposal of this device. They say just to dispose of it as you would any battery.
I see a lot of the negative reviews are on the return policy so wanted to point out how they designed the process to intentionally deceive you and cause you to overlook these key points in making your purchasing decision. Most companies put the ‘by continuing you agree’ ahead of the continue or make purchase, they intentionally placed it below and it requires you to scroll to see it. Happy to provide images but this site would not let me.
Reply from Lumen Inc2026-01-02
Thank you for your feedback.
We're sorry to hear that you are not satisfied with your Lumen.
Our goal is for everyone to have a positive experience using Lumen, and we try to be as transparent as possible when it comes to our policies.
Our terms and policies can be readily found in the FAQ, Checkout page, and Terms of Use on our website. The refund policy is presented before you complete the purchase on the checkout page. None of this is meant to be deceptive and it is all information that is easily accessible on our website.
Please feel free to reach back out to us if you have any other questions regarding your Lumen. We're always happy to assist.
All the Best,
The Lumen Team
Gives actionable data that is necessary to improving your health. The meal plans actually work to help me lose weight and feel my best.
Reply from Lumen Inc2025-12-30
Hi Julie,
Thank you for the 5-star review!
We’re thrilled to hear that the data has been helpful and that the meal plans are supporting your health goals. Keep up the great work :)
All the best,
The Lumen Team
I enjoy just relying on what the lumen says in order to see what I was going to eat.
Reply from Lumen Inc2025-12-30
Hi Bradrick,
Thank you for the 5-star review!
We’re glad you’re enjoying using Lumen as a guide for your food choices. Keep up the great work :)
All the best,
The Lumen Team
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