Huberman LabAMA #18: Cold Therapy Advice, Skin Health Tips, Motivation, Learning Strategies & More
CHAPTERS
- 0:00 – 4:20
Philanthropy Update: Matched Funding for Human Health Research
Huberman opens the AMA by announcing major expansion of the Huberman Lab/Scicom philanthropy program. Premium subscription revenues, now matched 3:1 by donors, are being directed into human research on depression, goal setting, and brain–immune interactions, with a commitment to translate outcomes into practical protocols.
- •Premium channel funds are used to support human research on mental, physical health, and performance.
- •Three dollar-for-dollar matching donors (including Tiny Foundation) now 4X the impact of premium funds.
- •Current/future projects: deliberate heat exposure for depression, NYU goal-setting research, brain–immune system interaction studies, and student training in ‘neuroscience and happiness’.
- •As data emerge, they will be shared and translated into real-world tools for listeners.
- 4:20 – 25:10
Skin Thinning With Age: Sun, Collagen, Red Light, and Dermatology Tools
Responding to a 77-year-old with thinning arm skin, Huberman outlines the role of sun damage, collagen loss, and moisture decline in aging skin. He details evidence-based interventions—sun protection strategies, oral collagen, red light therapy, prescription retinoids, laser resurfacing, diet, and moisturizers—to improve thickness and appearance.
- •Excessive UV exposure categorically accelerates skin aging; burning is not required to increase cancer risk.
- •Protection hierarchy: physical barriers, then mineral sunscreens (zinc oxide or titanium dioxide up to ~25%), with chemical sunscreens as acceptable occasional backups.
- •Oral collagen (15–30 g/day with vitamin C) shows moderate evidence for improving elasticity, plumpness, and smoothness; results are statistically significant but not dramatic.
- •Red/near-infrared light panels (10–15 min/day, ~5 days/week over months) moderately improve skin appearance.
- •Prescription retinoids and laser resurfacing (done by qualified derm-oncologists) can both reduce certain cancer risks and produce youthful appearance gains.
- •Diet low in fried/processed foods, adequate essential fatty acids, fruits, vegetables, and good gut health support skin from within.
- •Regular use of non-fragranced moisturizers and proper hydration further enhance skin appearance and comfort.
- 25:10 – 36:10
Cold Therapy and Sauna: How Cold, How Long, and How Safe?
Huberman answers how cold water must be for effective cold therapy, emphasizing subjective discomfort as the main guide rather than rigid numbers. He covers timing, typical temperatures, risks like hypothermia and blackout, and compares cold plunges with sauna use, stressing safety and minimum effective dose.
- •Effective cold exposure is ‘cold enough that you want to get out but can safely stay in’—typically 1–3 minutes for most people.
- •Subjective method: assess eagerness on a 1–10 scale; if you’re very eager, it’s probably too warm for adaptation.
- •Typical ranges: beginners ~55–60°F, experienced ~45–50°F; only go into low 40s/high 30s with supervision and caution.
- •Serious safety rules: never perform hyperventilation or heavy breathwork before cold; risk of suppressed gasp reflex, blackout, and drowning.
- •Hands and feet under the water increase discomfort; adaptation usually occurs after ~20 seconds of breathing control.
- •Sauna: choose a heat that is uncomfortable but safe; Huberman uses ~210°F for 10–20 minutes, alternating with cold.
- •Obsessing over exact degrees (e.g., 46 vs. 48°F) is unnecessary; focus on subjective response and safety.
- 36:10 – 48:40
Self-Motivation and New Routines: Contracts With Self and Growth Mindset
In response to a question about self-motivation for starting new routines, Huberman advocates internal contracts, written goals, and self-reward for effort. He warns against over-sharing goals for external validation and explains why making the work itself the reward is crucial for sustained motivation.
- •Written goals on paper plus daily checkmarks and a signed ‘contract with self’ can be powerful motivators.
- •Announcing goals publicly often substitutes social praise for actual behavior and can undermine follow-through.
- •Reward systems can include both positive reinforcement and fear setting (imagining worst consequences), but must be honest and realistic.
- •Phone removal (e.g., a dedicated phone box or giving it to someone) is a central tactic for protecting deep work blocks.
- •Growth mindset principles: effort is the reward; intrinsic motivation is stronger and more durable than external validation.
- •Huberman uses timed, non-interruptible blocks (no standing up, no phone) and finds after 20–30 minutes he wants to keep going.
- 48:40 – 58:50
REM Sleep, NSDR, and Emotional Processing
Huberman explains the importance of REM sleep for learning, emotional unburdening, and trauma-like processing. He provides practical steps to increase REM via schedule tweaks, early-day arousal, and non-sleep deep rest, and previews collaborative research with Matt Walker on NSDR’s REM-like brain states.
- •REM sleep is more concentrated in the latter part of the night and is rich in vivid, emotionally laden dreams.
- •During REM, the body is paralyzed (sleep atonia) and cannot release adrenaline, allowing intense emotional processing safely.
- •To get more REM: extend morning sleep by 10–30 minutes, exercise or do cold exposure early in the day, and avoid late caffeine and alcohol.
- •If you sleep poorly, the brain often compensates with REM rebound the following night when given adequate sleep opportunity.
- •NSDR (10–20 minutes, especially in the morning) may provide ‘REM-like rest’ with body still and mind active; formal studies with Walker’s lab are planned.
- •Free NSDR protocols (Huberman’s and Kelly Boys’) are available on YouTube, Spotify, and apps, and can be used offline after download.
- •No strongly validated, REM-specific drugs exist; some agents target deep sleep or are marketed for REM but remain controversial.
- 58:50 – 1:11:40
Boosting Student Learning: Meditation, Micro-Gaps, and Physical Activity
Asked about the top interventions schools could use to improve learning, Huberman proposes more sleep, brief daily meditation, micro-rest intervals during teaching, and embedding movement into the school day. He connects these strategies to neuroplasticity mechanisms, memory replay, and catecholamine-driven encoding.
- •Adequate sleep and, ideally, slightly later school start times would dramatically improve learning by supporting plasticity during deep and REM sleep.
- •A short (3–5+ minute) focused meditation/NSDR at the start of class can sharpen attention and working memory, as shown by Wendy Suzuki’s lab.
- •‘Micro-gaps’ of ~10 seconds where teachers pause without new input allow rapid (~20–30x speed) replay of newly learned material in hippocampus and cortex, consolidating learning.
- •Multiple micro-rests per hour (1–10) can significantly increase passive repetitions of key content without extra teaching time.
- •Physical activity (PE, runs, walks) elevates dopamine, epinephrine, and norepinephrine, making the brain more ready to encode new information—especially when learning immediately follows activity.
- •Worst-case structures for learning: poor sleep, continuous information ‘fire hose’ with no pauses, and heavy lunches without subsequent movement.
- 1:11:40 – 1:24:20
Shilajit, Testosterone, and Better-Supported Hormone Protocols
Huberman evaluates Shilajit as a testosterone and vitality supplement, drawing on Examine.com’s data. He concludes its effects are small and uncertain, and that lifestyle and better-studied supplements like Tongkat Ali generally offer more reliable benefits.
- •Shilajit is a Himalayan mineral pitch sometimes sold as paste or capsules; many counterfeit products exist.
- •Limited human data suggest small increases in FSH, testosterone, sperm quality, and modest LDL reductions, but overall effects are weak.
- •Dosage guidance is murky and the substance is messy to handle in paste form.
- •Foundational interventions (body composition, sleep, resistance and cardio training, nutrition, creatine, fish oil, gut health) should precede any testosterone supplement.
- •Sleep extension (even 20 minutes more REM) is likely more beneficial for testosterone than adding Shilajit.
- •Better-supported options for libido/testosterone include Tongkat Ali (likely via luteinizing hormone) and possibly Fadogia, with caveats, especially in women with menstrual cycles where FSH changes can be disruptive.
- •Huberman recommends only experimenting with Shilajit after basics and higher-evidence tools are in place, and then only from authenticated, lab-tested sources.
- 1:24:20 – 1:30:00
Writing Process, Deep Work, and High-Stakes Focus
Answering a question about his book-writing process, Huberman describes working ‘as fast as I carefully can,’ combining urgency with precision. He details rigid focus tactics—phone bans, timers, and high-stakes commitments—to overcome obstacles and maintain deep concentration.
- •He frames his motto as: “I go as fast as I carefully can,” balancing speed and accuracy.
- •For deep work, the phone is turned off and physically removed (or given to someone) with penalties promised if retrieved early.
- •He has used strong stakes—for example, promising $1,000 per lab member if he asked for his phone back before a deadline.
- •He uses timed blocks during which he doesn’t allow himself to stand up, even for the bathroom, until the timer ends.
- •After 20–30 minutes, immersion makes him want to keep going; interruptions become unwelcome.
- •He encourages similar high-stakes, self-imposed constraints for others seeking to write or do cognitively demanding work.
- 1:30:00
Addiction, Recovery Resources, and Closing Reflections
In the final segment, Huberman directs a listener to Huberman Lab materials on addiction and emphasizes the neurobiological rather than purely moral nature of addictive processes. He champions 12-step and clinical resources, highlights Anna Lembke’s work, and closes with gratitude, platform instructions, and a brief personal note.
- •Addiction is defined as a progressive narrowing of the things that bring pleasure, whether via substances or behaviors.
- •It reflects disrupted dopamine and neural circuit regulation, not simple lack of willpower.
- •Individuals should feel both compassion (it isn’t entirely their ‘fault’) and responsibility (they can and must seek help).
- •He recommends 12-step programs as widely available, zero-cost resources, supported by research from Stanford Psychiatry.
- •He points to the Huberman Lab episode with Dr. Anna Lembke and her book *Dopamine Nation* as core educational tools.
- •Huberman explains how hubermanlab.com search, timestamps, and an AI engine help users rapidly find addiction-focused content.
- •He ends with thanks to subscribers, encourages following/subscribing and reviews, notes upcoming guests and skin content, and briefly mentions his plan to adopt another bulldog.
