Huberman Lab

Improve Your Lymphatic System for Overall Health & Appearance

October 27, 2025

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  • The lymphatic system is absolutely essential for immediate and long-term health, serving as a crucial waste-clearing network that lacks a central pump and relies on mechanical forces like movement and breathing for circulation. 
  • Lymphatic drainage is critical for preventing local inflammation, tissue thickening, and cognitive impairment (brain fog), as the system clears excess fluid, cellular waste, and metabolites from the interstitial space. 
  • Movement, such as walking (aiming for at least 7,000 steps), rebounding, treading water, and diaphragmatic breathing (which affects the cisterna chyli), are primary, science-based tools for actively encouraging lymphatic flow. 
  • The brain possesses a lymphatic clearance system, known as the glymphatic system, which is crucial for clearing metabolic waste during sleep, and its efficiency is visibly correlated with morning appearance (e.g., reduced eye bags and facial puffiness). 
  • Sleeping on your side is the optimal position for maximizing glymphatic drainage in the brain, which is essential for cognitive function and mitigating age-related waste buildup associated with brain fog and dementia. 
  • Cardiovascular exercise supports heart health by promoting lymphoneogenesis (growth of new lymphatic vessels to the heart) and mitigating age-related inflammation in the heart, while long-wavelength light (red/infrared) can reduce localized inflammation and improve lymphatic flow in tissues. 

Segments

Introduction and Lymphatic Importance
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(00:00:00)
  • Key Takeaway: The lymphatic system is essential for immediate and long-term health, often overlooked, and practices related to it, though sometimes appearing odd, have a scientific basis.
  • Summary: The lymphatic system is crucial for health, clearing cellular waste and fluid, and requires mechanical forces from movement and breathing to circulate properly. Poor lymphatic clearance, especially in the face, contributes to issues like under-eye bags and brain fog, which can resolve quickly with proper drainage. Understanding its structure validates practices like rebounding and specific breathing techniques.
Circulatory System Context
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(00:04:11)
  • Key Takeaway: The circulatory system delivers oxygenated blood and nutrients via high-pressure arteries and capillaries, returning deoxygenated blood and waste products via thin-walled venous capillaries.
  • Summary: The heart pumps oxygenated blood through arteries to tissues, delivering oxygen, glucose, and hormones. Cells use these resources and generate waste products like CO2 and ammonia into the extracellular (interstitial) space. Venous capillaries then reabsorb some waste and water, returning deoxygenated blood to the heart and lungs for waste expulsion.
Lymphatic System Function and Need
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(00:11:03)
  • Key Takeaway: The lymphatic system acts as a necessary third system to collect the 3-4 liters of excess fluid, waste products, and potential contaminants left in the interstitial space that the venous system does not reclaim.
  • Summary: If lymphatic drainage fails, the buildup of fluid, waste products (like CO2 and ammonia), and amino acids in tissues promotes infection and inflammation, potentially leading to tissue thickening. This lack of clearance in the brain directly causes brain fog and cognitive impairment.
Sponsor Acknowledgement
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(00:14:48)
  • Key Takeaway: Proper hydration and electrolyte balance, particularly sodium, magnesium, and potassium, are vital for cognitive and physical performance.
  • Summary: Element is an electrolyte drink providing necessary electrolytes without sugar, crucial for cell function, especially neurons. Drinking Element upon waking and during exercise supports adequate hydration levels, which are easily diminished by dehydration.
Lymphatic Vessel Mechanics and Movement
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(00:17:24)
  • Key Takeaway: Lymphatic vessels are one-way tubes intimately related to muscle and fascia, requiring mechanical forces from body movement because the system lacks a central pump to fight gravity.
  • Summary: Lymphatic vessels are distributed everywhere in the body, collecting excess fluid and waste from the interstitial space and moving it unidirectionally toward the heart. Since there is no heart-like pump, low-level muscular contractions from walking or exercise create the necessary force to move lymph fluid along these vessels.
Movement Tools for Lymphatic Flow
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(00:26:24)
  • Key Takeaway: Activities involving acceleration and deceleration, such as rebounding, treading water, and swimming, are highly effective for lymphatic drainage because the one-way vessels capture the upward movement.
  • Summary: Rebounding (jumping on a small trampoline) and swimming create mechanical forces that effectively move lymphatic fluid upward toward the heart, despite the downward pull of gravity. This movement stimulates the superficial lymphatic capillaries through shearing of the skin.
Diaphragmatic Breathing for Drainage
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(00:27:41)
  • Key Takeaway: Diaphragmatic breathing creates a pressure differential that encourages lymph fluid to move from the cisterna chyli reservoir back into the venous blood supply.
  • Summary: Inhaling deeply so the belly moves out (diaphragmatic breathing) creates a pressure change around the cisterna chyli, a major lymph reservoir. Performing this technique a few times daily significantly encourages lymphatic drainage, especially when movement is restricted, like sitting at a desk or on a plane.
Lymphatic Massage Techniques
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(00:34:00)
  • Key Takeaway: Effective lymphatic massage involves intentionally light pressure, gentle rubbing, and sometimes light tapping, specifically avoiding deep pressure that could collapse the delicate lymphatic capillaries.
  • Summary: Lymphatic massage is a recognized medical practice, particularly for treating lymphedema, and requires a very light touch because the capillaries are small and easily damaged. Protocols often involve encouraging drainage toward the clavicles and cisterna chyli, but direct massaging of lymph nodes should be left to professionals.
Sponsor: AGZ for Sleep
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(00:37:26)
  • Key Takeaway: AGZ is a comprehensive nightly drink formulated with clinically supported compounds to improve sleep quality and depth, simplifying the process of supplementing for better rest.
  • Summary: AGZ combines the best sleep-supporting compounds in optimal ratios to help users fall asleep, stay asleep, and wake up refreshed. Taking this supplement 30 to 60 minutes before bed has been shown to dramatically increase sleep quality and depth.
Lymphatic Return to Blood Supply
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(00:38:55)
  • Key Takeaway: Lymph fluid returns to the venous blood supply via the right and left thoracic ducts, which empty into the subclavian veins near the clavicles, making this area a major drainage site.
  • Summary: The right thoracic duct drains lymph from the right side of the face, arm, and upper torso, while the left thoracic duct handles the rest of the body. Encouraging drainage toward the clavicles, often through light padding during massage, facilitates the final step of returning lymph fluid to circulation.
Immune Surveillance in Lymph Nodes
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(00:45:02)
  • Key Takeaway: Lymph nodes serve as immune checkpoints where sequestered lymph fluid is evaluated by T cells and B cells for the presence of viruses, bacteria, or other foreign invaders.
  • Summary: Swollen or sore lymph nodes indicate that the immune system is actively recruiting cells to combat potential threats present in the lymph fluid, which reflects the body’s overall circulation. It is important not to squeeze these nodes, as this interferes with the immune surveillance process occurring within them.
Lymphedema and Cancer Treatment
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(00:54:24)
  • Key Takeaway: Lymphedema, the chronic swelling from lymphatic fluid buildup, often results from cancer treatments that intentionally destroy lymph nodes, leading to local inflammation and tissue thickening.
  • Summary: Stages of lymphedema range from temporary swelling (Stage 2, relieved by elevation) to permanent tissue changes (Stages 3 and 4) caused by chronic inflammation and reduced oxygen availability. Tools like compression boots can help move this stagnant fluid back toward the drainage system.
Introduction to Glymphatic System
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(01:00:09)
  • Key Takeaway: The glymphatic system is the brain’s specific lymphatic drainage system, and optimizing its function is crucial for reducing morning facial swelling and improving wakefulness and cognition.
  • Summary: The brain possesses a lymphatic clearance system, termed the glymphatic system, which is highly active during sleep. Understanding its architecture allows for straightforward protocols to reduce brain fog and morning puffiness under the eyes.
Glymphatic System and Appearance
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(00:59:00)
  • Key Takeaway: Poor sleep quality directly results in noticeable negative changes in facial appearance, including sagging eyes and increased wrinkles, due to impaired brain waste clearance.
  • Summary: The glymphatic system, the brain’s lymphatic counterpart, clears waste products during sleep; insufficient sleep prevents this clearance, leading to visible changes like puffiness and reduced cognitive function. Comparing photos after a great night’s sleep versus a poor night’s sleep reveals dramatic differences in facial appearance and mental acuity. This waste recycling process is essential for maintaining normal brain function and appearance.
Sponsor Break: Eight Sleep
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(01:00:07)
  • Key Takeaway: Optimal sleep temperature regulation is achieved via smart mattress covers that automatically adjust cooling and heating based on sleep stage via AI (Autopilot).
  • Summary: Eight Sleep’s Pod5 automatically regulates bed temperature to facilitate the necessary drop and subsequent rise in core body temperature required for deep sleep and waking refreshed. The Autopilot feature uses AI to adjust temperature across sleep stages and can elevate the head to address snoring. The device also includes an integrated speaker for relaxation audio, including NSDR scripts developed with the speaker.
Glymphatic System Discovery and Function
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(01:01:41)
  • Key Takeaway: The brain’s lymphatic system was scientifically verified in 2012, operating during sleep by expanding perivascular spaces around vasculature via astrocyte activity.
  • Summary: Cerebrospinal fluid collects waste products from highly metabolic brain cells, and during sleep, astrocytes push out to enlarge perivascular spaces by 60%, expressing Aquaporin 4 channels. This allows cerebrospinal fluid to flow along blood vessels to be cleared into the venous blood supply, a process vital for preventing waste buildup like amyloid plaques. This discovery was initially made earlier by Patricia Grady but was later confirmed by Michael Nedergaard’s group.
Optimizing Glymphatic Clearance During Sleep
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(01:12:22)
  • Key Takeaway: Sleeping on your side is the best position to encourage maximal glymphatic drainage in the brain, while alcohol and insufficient sleep impair this clearance.
  • Summary: Side sleeping appears superior to back or stomach sleeping for glymphatic drainage, and slightly elevating the head can also assist in preventing fluid pooling under the eyes. Impaired glymphatic clearance due to lack of sleep or alcohol intake is linked to increased inflammatory molecules and buildup of substances associated with dementia. Cardiovascular exercise can positively influence glymphatic clearance later that night.
Facial Lymphatic Massage and Appearance
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(01:17:27)
  • Key Takeaway: Specific, ordered lymphatic and fascial massage techniques for the face can dramatically reduce morning puffiness and improve youthful appearance by clearing interstitial fluid.
  • Summary: Puffy eyes and face upon waking are often due to fluid accumulation that can be addressed by sleeping with the head slightly elevated. Gentle pressure-based lymphatic massage, performed in the correct sequence, can significantly improve facial contours by encouraging lymph drainage from tiny capillaries around the eyes and face. Proper technique is crucial, as incorrect application will not yield the striking aesthetic results seen with expert methods.
Sponsor Break: Function Lab Testing
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(01:21:21)
  • Key Takeaway: Comprehensive lab testing, including advanced markers for toxins like BPA and PFAS, is vital for health insights and can be accessed affordably through Function.
  • Summary: Function provides over 100 advanced lab tests analyzing heart, hormone, immune, and nutrient levels, offering insights from expert doctors. The service simplifies complex blood testing, which is crucial for detecting issues like elevated mercury levels that might otherwise go unnoticed. Early access is currently being offered to Huberman Podcast listeners due to high demand.
Hydration and Cardiovascular Exercise Benefits
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(01:23:09)
  • Key Takeaway: Adequate hydration directly supports lymphatic flow, and regular cardiovascular exercise induces lymphoneogenesis, improving waste clearance from the heart.
  • Summary: Drinking sufficient water, especially 16-32 ounces upon waking, helps balance blood volume and sodium, which in turn improves lymphatic drainage and reduces general fluid retention (edema). Cardiovascular exercise promotes the growth and remodeling of lymphatic vessels within the heart tissue, which mitigates inflammation and supports cardiac function as we age. This exercise-induced lymphatic remodeling is shown to significantly offset inflammation in the aging heart.
Light Exposure and Lymphatic Health
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(01:31:13)
  • Key Takeaway: Long-wavelength light (red/near-infrared/infrared) improves mitochondrial function, reduces inflammation, and supports lymphatic clearance in the skin and underlying tissues.
  • Summary: Long-wavelength light, available from devices or low solar angle sunlight, penetrates deep into the skin to charge mitochondria, leading to increased cellular energy and reduced inflammation. This light exposure has been demonstrated to reduce lymphedema and improve skin appearance partly by enhancing the function of the lymphatic system in that area. Exposure should ideally be timed when UV index is lower, such as late afternoon or evening, or via a device that excludes UV light.
Final Takeaways and Podcast Support
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(01:36:05)
  • Key Takeaway: The lymphatic system is a critical, non-pumped network intimately linked to all organs, requiring mechanical forces from movement and breathing for proper function.
  • Summary: The lymphatic system is crucial for waste removal and immune surveillance across the entire body, necessitating active support through movement since it lacks a central pump. The recent appreciation for its role, especially in the brain via the glymphatic system, underscores its centrality to overall health and longevity. Listeners are encouraged to support the podcast via subscriptions, reviews, and sponsor engagement.