Lumen Reviews – Does Lumen Product Really Work?

4.3/ 5.0

Lumen is the first handheld device that supposedly measures metabolism. It uses a carbon dioxide (CO2) sensor and flow meter to determine the CO2 concentration in one’s breath, which helps to show the type of fuel your body uses to produce energy.


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Overview Of Lumen

Everyone is looking for the latest trick and trend that makes them look and feel the way they want – that’s why fitness trackers, sleep trackers, and smartwatches are some of the most popular devices in the fitness zeitgeist.

Staying healthy, however, is not all about keeping track of your activities, sleep quality, and heart rate. You also need to check what you consume. But not everyone can afford fitness experts, personal nutritionists, or trainers, which is where Lumen comes in.

According to the manufacturer, the device helps consumers understand their bodies better and the role their metabolism plays in them. With personalized nutrition information, easy-to-understand metrics, and in-app lesions, Lumen is a convenient and efficient device that helps people gain better insight into their wellbeing.

Lumen reviews also suggest it helps you figure out if you have adequate energy before a workout or require fueling up—more on that below.

How Does Lumen Work?

Lumen is a product consisting of the Lumen device and the Lumen app. The device measures your metabolism by evaluating the composition of your breath. It also measures the carbon dioxide levels in your breath to figure out if your body uses carbs or fats for fuel.

On the other hand, the Lumen app provides you with a daily measurement of your energy source – fats and carbohydrates on a scale of 1 to 5, based on your respiratory exchange ratio (RER). Lumen then uses the measurements to offer your flex score, showing how flexible your metabolism is.

Who Is The Manufacturer Of Lumen?

Lumen, a firm based in Tel Aviv, Israel, manufactures the Lumen Metabolism Tracker. The device started with twin sisters Merav and Michal –Ironman winners and Ph.D. holders in physiology.
As scientists and athletes, Michal and Merav were passionate about creating a way to offer personalized nutrition.

They believed that a healthy metabolism is a key to improved health and that everyone can attain it. However, the only way to measure metabolism was expensive and time-consuming.

Therefore, they teamed up with revolutionary entrepreneurs Daniel, Dror, and Avi, and after two years, they developed the first Lumen prototype. After four years and hundreds of beta users, the team launched Lumen on Indiegogo. Now the tech is available to all and everywhere.


Lumen Review – Health Web Magazine Images

What Are The Features Included in the Lumen?

Lumen consists of the following features:

Lumen Device – The portable unit measures your metabolism from your breath. You need to inhale for a few seconds and exhale for another. Sometimes you have to inhale and exhale twice to get accurate results.
CO2 Sensor – Lumen comes with a carbon dioxide sensor and flow meter that determines the CO2 concentration in your breath. It helps you figure out the form of fuel your body uses for energy.
Lumen Metabolism Tracker App – The app provides you with daily measurements of your source of energy (either carbs or fats) on a scale of 1 to 5, based on your RER. The respiratory exchange ratio is the rate between the metabolic production of CO2 and the uptake of oxygen (O2).

The Science Behind Lumen

Unlike metabolic carts, Lumen solely focuses on carbon dioxide and does not measure O2 levels or consumption. The device measures CO2 and flow rate when exhaling to determine the peak CO2 levels equivalent to alveolar gaseous concentration.

The carbon dioxide concentration is measured using a specific breath maneuver, which is by inhaling a volume of air via the Lumen device (dynamic to every individual), holding it for ten seconds, and exhaling fully.

The results are delivered in real-time through the Lumen app and stored for future reference. The tech has been scientifically proven and peer-reviewed to measure metabolic fuel usage compared to the gold standard RER for assessing metabolism in numerous validation studies.

What Are The Benefits Of Lumen?

  • Lumen might help improve metabolic flexibility and enable you to lose weight sustainably.
  • It might help you boost your body’s ability to burn fat, thus reducing your hunger levels and making your body less dependent on snacks and carbs.
  • The tracker might help bolster energy levels by developing a high-functioning metabolism.
  • It might help enhance metabolic flexibility, and your body’s ability to shift between using carbs and fats.
  • Lumen might help you enjoy an optimized workout performance and increased lean muscle mass.
  • The device is purportedly scientifically proven to meet the gold standards of metabolism measurement (RER).

What Are The Drawbacks Of Lumen?

  • Precise measuring can be tedious.
  • It is costly.
  • The manufacturer does not provide any free trials.

FAQs: Consumer Questions & Answers

In our research for this report, we found that consumers are frequently asking the following questions online in regard to Lumen.

According to the manufacturer, Lumen is safe. There have not been any warnings or complaints concerning the use of Lumen. It is scientifically proven to meet the golden standard of metabolism measurement (RER) in various validation studies.

Lumen is a rather costly metabolism tracker. You can purchase it on the official website, Amazon, and other third-party retailers.

Yes, it does. The metabolism tracker comes with a 30-day money-back guarantee. Therefore, if you do not like it, you can return it to the manufacturer and receive a full refund. However, the manufacturer does not provide you with any free trials.

The manufacturer recommends measuring your metabolism first thing in the morning, before your breakfast or head to the gym. You should also measure your metabolic rate every morning, 30 minutes before and after exercise, before consuming any meals, after eating (wait for one to two hours), after fasting, and before going to bed.

Reviews are beneficial since they allow you to learn about the benefits and drawbacks of a product and whether to invest in a particular metabolism tracker in case another has more benefits to offer.

Lumen was designed for individuals over the age of 16 to help enhance their metabolic flexibility to enjoy improved workouts, better sleep patterns, and effortless weight loss. However, particular conditions can impact Lumen results, therefore, the manufacturer does not recommend the product for diabetics, asthmatics, COPD patients, pregnant, cancer patients, thyroid disorder patients, and individuals with kidney disease. To be safe, ensure to check with a certified professional before using the device.

You can learn more about Lumen on the official website and various sponsored websites.

What Are Consumers Saying About Lumen?

There are mixed Lumen reviews online. Most consumers said it helped them work out better and plan their meals. However, most users suggested it is costly and might not be easy to use.

Trying to find an effective weight loss supplement can be an overwhelming experience. Weight loss supplements often claim to provide outlandish results. Weight loss products should be analyzed based on four key factors: potential to help the body burn more fat, potential to increase metabolism, potential to meet weight loss* goals, and quality of ingredients backed by clinical studies.

Below you'll find some of the most effective weight loss supplements on the market today, in our opinion.

Rating Table Rating Table

Our Top Products

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Phenocal Rating
  • Promotes Rapid Weight Loss

  • Increases Metabolic Rate

  • Increases Energy Levels

  • Powerful Fat-Burning Properties

  • Support Appetite Control


  • In a survey, 88% Of users experienced a reduction in their overall body weight within the first 28 days of using Phenocal
  • 100% of users reported a reduction in their appetite & cravings
  • 94% of users reported massive increases in their energy for more effective workouts
  • 81% of users experienced a reduction in their belly fat
  • 94% of users reported an increase in their metabolic rate
  • Balances blood sugar levels
  • 56% of users experienced they are less stressed than before
  • Contains powerful immune-boosting antioxidants
  • Improves your body confidence
  • Provides long-term benefits for sustainable weight loss
  • There are no harmful side effects
  • Will not over-stimulate or produce jitters
  • Offers a 60-day money-back guarantee
  • Customers are not required to sign up for an auto-shipping deliver


  • Consumer demand results in low product availability at times
  • Only available on the official website and Amazon

The Bottom Line

Maximum strength Phenocal is a high-quality brand that not only produces the fast, safe weight loss we would expect to see in this type of supplement but keeps the pounds off over the long term too!

In a survey, 88% of users saw a significant reduction in their overall body weight within the first 28 days! They are extremely satisfied with Phenocal, reporting that they were able to reach their goal weight effortlessly, enjoying the added energy boost it gave them, so they felt more motivated to exercise.


Unlike some weight loss supplements that only provide one or two benefits, Phenocal gives consumers complete support to help them overcome the obstacles many people face when dieting, such as overeating and cravings for high-carb, sugary foods. 100% of users reported a reduction in their appetite & cravings within the first 28 days of using Phenocal.

The Phenocal formula contains a rich collection of powerful proven, natural key ingredients, many of which have potent antioxidant properties that enhance overall health and support the immune system. It’s important to note too, that this doctor-developed formula contains no dangerous stimulants, and there have never been any reports of unpleasant side effects.

Phenocal is produced by Pharmaxa Labs, a well-established, trusted name in the health supplement industry. They offer a no-hassle, 60-day money-back guarantee on Phenocal, which proves how confident they are that the product will result in the fast, permanent weight loss their customers want. With Phenocal, numerous men and women have finally reached their goals and now enjoy a firm, toned, overall healthier body.

Phenocal Customer Reviews Over The Internet


Here Leah Cox's Amazing Story

“It Helps Me To Control My Weight And My Food Cravings.”

Leah C., Age 54
5 Star

Here Helen's Amazing Story

“It's Been About Three Months Now. I've Lost Weight, My Clothes Fit Better. I Have Like A Ton More Energy Too. I've Just Felt Energized With Phenocal & It's Just Been Great For Me.”

Helen B., Age 50
5 Star

In my opinion Phenocal is a fantastic product!

Dave L. 5 Star

“I have been struggling with my weight for almost my entire life. No matter what I tried, I just couldn't seem to get the motivation to lose that extra weight. I have tried many different weight loss pills and diet programs, and none of them worked. After using Phenocal for almost three months, I have dropped more than 40 pounds… and the number on the scale is still going down. In my opinion Phenocal is a fantastic product. Thank you.” **


Phenocal Is One Of The Most Effective Products

Kate P. 5 Star

“I recently ordered four bottles of Phenocal. So far I've taken one bottle, and I feel like my clothes are getting a little looser every day. I have more energy too. I try not to get on the scale, though, because in the past weighing myself all the time drove me crazy! I don't want to let a number determine how I feel about myself or bring me down. As a busy mom with three kids I don't have a ton of time for exercise. I'm not crazy about diets, but I do make an effort to eat healthy most of the time. Even though I'm not following a strict diet and exercise program, the results have been really good! I would recommend Phenocal to anybody trying to lose weight.” **

Keto Blast Pro
#2 Keto Blast Pro
  • Promotes Rapid Weight Loss

  • Increases Metabolic Rate

  • Increases Energy Levels

  • Powerful Fat-Burning Properties

  • Support Appetite Control


  • Contains an all-natural blend of ingredients
  • It is said to target fat on the hips, stomach, and waist


  • It may take several months to produce results
  • Free samples are not available
  • It is a new product with limited customer reviews
  • Solid clinical data is not provided

The Bottom Line

While the diet product Keto Blast Pro may appeal to consumers for several reasons, particularly those who follow the Keto diet and prefer taking supplements in this form as opposed to pills, it is a relatively new product with limited information available. The formula is completely natural and therefore unlikely to produce any harmful side effects, but there is no solid evidence to show that it actually targets areas of fat on the body or prevents the accumulation of more fat over the long term. Additionally, it appears that this supplement may take several months to produce any noticeable results and it is not clear exactly how well it works on its own, without the benefits of regular exercise and a healthy diet plan.

#3 Razalean
  • Promotes Rapid Weight Loss

  • Increases Metabolic Rate

  • Increases Energy Levels

  • Powerful Fat-Burning Properties

  • Support Appetite Control


  • It is said to have multiple benefits
  • The formula is all natural and organic


  • Razalean is expensive
  • It has received some negative customer reviews
  • There are some reports of side effects
  • Clinical study data is not available

The Bottom Line

The diet product Razalean claims to help individuals lose weight in several ways, including increasing the metabolism and burning fat more effectively, but there is little evidence to show it works as well as the manufacturer claims it does. While Razalean contains a blend of natural, organic ingredients, including Garcinia Cambogia and Raspberry Ketones, which are relatively popular and commonly used in these types of supplements, it may not be completely safe for all individuals and there have been some reports of side effects occurring. It appears that some customers have indeed experienced some positive results from using the product, but generally, independent reviews are mixed, and this brand is more expensive than many comparable products.

Dietary supplement recommendations can be found everywhere — in commercials, through social media influencers, and from your neighbors, friends, and family. With so many different opinions, it can be hard to know which supplement is right for you. While most quality supplements undoubtedly provide health benefits, each will work in its own unique way, so it's important to determine which one will help you reach your health goals. Below you will find our subjective assessment of Lumen based on the information available to us and our estimation of its overall efficacy.

  • Promotes Rapid Weight Loss
  • Increases Metabolic Rate
  • Increases Energy Levels
  • Powerful Fat-Burning Properties
  • Support Appetite Control

Overall Rating

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Phenocal - A Better Alternative?

Promotes Rapid Weight Loss
Increases Metabolic Rate
Increases Energy Levels
Powerful Fat-Burning Properties
Support Appetite Control

Phenocal is a potent weight loss supplement that has proven successful in producing significant results. In a survey within the first 4 weeks of using Phenocal, over 88% of users saw a significant reduction in their overall body weight. The Phenocal all-natural, maximum strength formula helps individuals reach their weight loss goals quickly and safely. 100% of users reported a reduction in their appetite & cravings after using Phenocal as directed. Its powerful blend of powerful proven ingredients increases fat-burning, and 94% of users reported boosts in their energy levels and metabolism within the first 28 days after using Phenocal. You can find out more about Phenocal now.

Read More About Phenocal Nowarrow

Final Words

Lumen is a revolutionary metabolism tracker that enables individuals to understand their bodies and the role their metabolism plays in them. With personalized nutrition information and easy-to-comprehend metrics, Lumen is a convenient and efficient device that may help individuals looking to gain better insight into their health.

However, the many Lumen reviews are not pleased with its cost. Others suggest it might not be easy to use. It is also not suitable for persons with issues such as diabetes or COPD. Therefore, make sure to check with a professional before investing in the product.

*Result may vary. If you are pregnant, nursing, have a serious medical condition, or have a history of heart conditions we suggest consulting with a physician before using any supplement. The information contained in this website is provided for general informational purposes only. It is not intended to diagnose, treat, cure, or prevent any disease and should not be relied upon as a medical advice. Always consult your doctor before using any supplements.

† Based on an internal customer response survey of subgroups of individuals. This is a subjective survey and in no way should it be intended to be interpreted as a clinical study. Results may vary.


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