The Quantlet: The World’s First Wearable That Uses Cold & Light To Shut Down Inflammation, Enhance Sleep, Improve Cognition & Amplify Performance.

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Biohacking, Podcast

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Today, you get to learn about a new wearable device that gives you all the benefits of cold thermogenesis…

…via a tiny device that you wear your wrist like a wristwatch.

But this device goes way beyond that, including generating infrared light that induces a release of nitric oxide and ATP, reducing travel and jet lag symptoms, inducing sleep, shutting down inflammation…

…and much more.

You must listen to this episode. My mind was blown.
What is the Quantlet? Basically, it is a wearable that produces two things: cold and light.

Why cold?

Physical performance is deeply tied to your body’s temperature. When you get hot, your performance suffers. This is because key respiratory proteins and cellular enzymes change shape and may even malfunction if they overheat, which impacts certain metabolic processes. Keeping the body cool during exercise or exertion can therefore help you better perform.

Cold Thermogenesis (CT), as it is known scientifically, is an exciting new area of research which has recently shown positive effects on thyroid function, fat loss, exercise efficiency and inflammation reduction. This is because recent studies have found that adults have more brown adipose tissue (BAT) than was previously believed, which can significantly increase energy expenditure in response to cold exposure.

Why light?

The use of visible and near-infrared (NIR) light for reducing pain, inflammation and edema, has been known for almost forty years. The effects of photobiomodulation, as it is known scientifically, are photochemical – just like photosynthesis in plants. When the correct power, frequency and application time are used, light reduces oxidative stress and increases ATP.

This in turn improves cell metabolism and reduces inflammation. In recent studies, photobiomodulation has demonstrated increased exercise capacity and longer exercise times, as well as improved biomarkers (including reduced lactate, creatine kinase, and CRP) after exercise in people treated with red and infrared light. Photobiomodulation has also been reported to release certain brain compounds that positively affect mood and sleep.

During today's podcast, you'll discover:

-Why irradiating your blood with light is one of the most powerful vasodilation techniques known to man…

-Why it's crucial that you figure out how to reduce your blood thickness, especially if you travel and or if you get jet lag…

-How light exposure and a process called photobiomodulation induces the release of nitric oxide…

-Why (until now) science hasn't yet discovered how to get the positive benefits of light and cold at the same time…

-How a thermo-electric cooler works and why it allows you to fool your body into not vasoconstricting in response to cold…

-When you should use light and cold, for how long, and when not to use light and cold…

-Whether the Quantlet produces Bluetooth, WiFi or other EMF frequencies…

-How well the Quantlet holds up under conditions like water immersion or workouts…

-And much more!

This episode is brought to you by:

Thrive Market – Visit and enter to win a $1,000 shopping spree at Thrive Market!

Four Sigma Foods – Visit and use code ‘bengreenfield' for 15% off!

Resources from this episode:

The Quantlet

Quantlet video for Indiegogo Campaign

-Interview with Prof. Michael Hamblin (Harvard and Quantlet's Scientific Advisor)

-Interview with James Carroll (LLLT expert and Quantlet's Light Module Developer)

Ben Greenfield's Heat-Hacking Experiment in LAVA Magazine

The Peltier thermo-electric cooling effect

Do you have questions, comments or feedback about the Quantlet? Leave your thoughts below and one of us will reply.

Ask Ben a Podcast Question

18 thoughts on “The Quantlet: The World’s First Wearable That Uses Cold & Light To Shut Down Inflammation, Enhance Sleep, Improve Cognition & Amplify Performance.

  1. Keith says:

    Looks like they are out of business already. App removed from Apple store and haven’t been able to order from their site in many months.

    1. mark vishnevsky says:

      Yeah looks like a scam to me. I questioned it from the get go. I was friends on FB with one of the founders and he quickly deleted me when I questioned the product.

    2. Dove says:

      OMG R.I.P. …. That’s exactly what I was afraid of and Jack looks kinda disgruntled in his recent vids that I’m also wondering if he was personally attacked and then the entire project sabotaged and shut down(??!!??)
      It’s now 2023 and the site still says “critical error”…

  2. Jim says:

    Hey Ben,
    It’s been about a year since your Quantlet podcast and I have been looking for an update report you said you would put out there after testing. The only thing I have seen is you response to a couple questions almost a year ago. Awesome job. Thanks

  3. Amy Munro says:

    Hi Ben.
    when are you going to report on your results with the quantlet? I know that they have been available for some time now. Look forward to hearing your impressions. thanks much.

  4. Jose A says:

    Ben…..are you using the quantlet? Will you review, good or bad?

    1. I am using it! I have been really happy with it.

  5. Perry says:

    Just wondering if you ever received one of these Quantlet devices to test? I cannot seem to find anything with respect to this being released yet.

    Have you tested it? Does it work as claimed?

    1. Yes, got one, tested it and it is AMAZING. Highly recommend. Works as claimed.

  6. snobrien says:

    By my understanding of the peltier effect, apply a voltage and you get a difference in temp between the plates. if you stack cooler on top of cooler you can get a decent total sum of temp difference but 2 things… 1. Peltier TEC is a power hungry cooling method. I don't see how a bracelet, assuming you have the equivalent of an iphone battery, which wouldn't even fit in the bracelet, would last more than 15 minutes assuming idealistic, unrealistic battery performance and neglecting the power of the case fan to cool the hot side. Maybe the peltier isn't pulling 60W heat flux from the wrist through the bracelet because that would more than likely require a motorcycle battery.

    2. The heat that the Peltier heat pump transfers does not just get sucked into another dimension, it needs to be transferred to air, assuming we have like 5W from your wrist plus the heat that the peltier cooler generates under power, is it going to be cooking at degrees on your wrist? 60 watts is a buttload of heat power for a device with a tiny computer fan to dissipate…

    So if the heat transfer is more a function of increased circulation due to light therapy and using the skin to radiate and convect heat to the ambient environment, we resolve the power issue for the peltier and fan, but what is the Peltier being used for?

    I'm not trying to be cynical, just trying to understand. :)

    1. harvjag says:

      You are making several assumptions that, while seemingly logical, are incorrect. Firstly, our battery is a lot larger than that of an iphone. Secondly, our proprietary and patent-pending heat sink/case/fan combination along with the higher power available from our larger battery should help clarify your misconceptions.

      That being said, I'm happy to go into a few more specifics: the volumetric specific heat of blood (cv) has a value of 3.6 J/ml-C. The blood flow rate to the hand is typically about 1.4 ml/sec at rest and was confirmed by measurements of flow velocities made by Doppler Ultrasound. If we assume a flow rate of 3 ml/sec, then to achieve 68W of heat transfer as demonstrated by Stanford, the change in blood temperature through the hand must be ~6.3 deg. Regarding the thermal conductivity of skin varies, it varies from layer to layer, but we have found that a representative mean value is 0.004 W/cm-K.

      If the blood enters the hand at 37C and leaves at 37C-6.3C, the mean temperature of blood in the hand is approximately 33.9C. When the cold surface of the cooling device is at ~10C, and the dT=~24C, the heat transfer through the tissue is approximately 58W. This is not far from the heat transfer rates measured by Stanford researchers and close to what we have modeled in our experiments.

  7. MatthewTS says:

    First, any time Jack Cruse is involved I have to question the validity of the claims.

    Second, what kind of performance increase would one expect to see for endurance vs. strength vs "hybrid" sports? I know it's early in the process, but before considering dropping $600 to be an early adopter it would be nice to see some kind of blinded pilot study or studies showing what this is capable of…

    1. snobrien says:

      Absolutely! I tried to get more information from their marketing campaign but I couldn't stand watching his snake oil pitch. Thankfully it sounds like Ben will be our guinea pig… hopefully we will hear more soon!

  8. metronome1523 says:

    So I had a question about the Quantlet and how it works with EXERCISE. Q: Doesn't Dr. Pall PhD researcher consider NO a bad thing and how would this work with the Quantlet?

  9. Tatiana Hart says:

    Hi Ben,

    about two weeks ago my blood test panel showed a high BUN/Creatinine Ratio. What contributes to a high BUN/Creatinine Ratio? Are you able to recommend means and methods to mitigate the problem naturally?

    Thank you very much,


    1. Dehydration, excessive training, and inflammation are top 3 reasons. Sometimes too much creatine too. That's where I'd start!

    2. harvjag says:

      Tatiana, fully concur with Ben. Best way to combat high BUN/Creatinine is through better hydration. Not all water is created equal, believe it or not. Direct from the source spring water is the safest bet in my experience along with mineral rich bottled spring water.

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