Breathwork · Cold exposure · Evidence review
The Wim Hof breathing method is one of the most widely practiced breathing techniques in the world, and one of the most frequently misdescribed. This guide covers what it is, how the breathing works, how to do it safely, and — separately — what the research does and does not currently support.
Most articles about the Wim Hof Method fall into one of two groups. The first repeats a list of benefits with no indication of where the evidence for each one stops. The second dismisses the whole thing. Neither is useful if you are simply trying to decide whether to try it on a Tuesday morning.
This guide takes a third approach. It explains the method fully — the three pillars, the breathing cycle, what happens physiologically, and how a beginner would actually start — and then treats the science as its own section, with each claim graded honestly. Some findings are real and interesting. Others have been stretched well past what the studies measured. You should be able to tell which is which by the end.
60-second overview
The short version first: the three core pillars behind the method. The written guide below stands on its own.
An ESISLABS original. Watch on YouTube.
Quick answer
The Wim Hof breathing method is a structured breathing exercise built around repeated cycles of rapid, deep breathing followed by a voluntary breath hold. A typical round is 30 to 40 full breaths, then an exhale and a hold for as long as is comfortable, then a recovery breath held for around 15 seconds. Most people repeat this three or four times. It is one of three components in the wider Wim Hof Method, alongside gradual cold exposure and a mindset or commitment element. The breathing produces clear, measurable short-term changes in the body — and those short-term changes are not the same thing as long-term health benefits, a distinction this guide keeps separate throughout.
Read this first
Where you practice matters more than how well you practice
Wim Hof-style breathing involves deliberate over-breathing followed by breath retention. That combination can cause light-headedness and, in some people, fainting. Fainting on a sofa is a non-event. Fainting in the wrong place is not.
Never practice this breathing:
- in or near water of any kind — including a bath, a pool, a lake, the sea, or a shower;
- while driving or as a passenger operating anything;
- while operating machinery or tools;
- while standing, walking, or on any raised surface;
- anywhere a sudden loss of consciousness could cause injury.
Practice sitting or lying down, on a surface where it would be safe to lose consciousness. This is the single most important rule in the method, and it is not optional or advanced-level guidance.
If you are pregnant, have a heart condition, a history of fainting or seizures, high blood pressure, a respiratory condition, or any other health condition — or if you take prescription medication — speak with a qualified healthcare professional before starting. This article is general education, not medical advice, and it is not a substitute for individual guidance.
Key takeaways
- The method has three pillars: breathing, gradual cold exposure, and mindset. They are separate practices and are often studied separately.
- The breathing works primarily by lowering carbon dioxide, not by increasing oxygen. Blood oxygen falls during the breath hold.
- The best-known study found that trained participants dampened an experimentally induced inflammatory response — which is not the same as boosting immunity.
- An acute physiological effect is not a long-term health outcome. Much of the evidence base measures the first and infers the second.
- Safety is about location. Never in or near water, never driving, never standing.
- The overall evidence base is small, short, and methodologically limited, as the most recent systematic review concluded.
What Is the Wim Hof Method?
The Wim Hof Method is a training system developed by the Dutch athlete Wim Hof, known publicly for a series of cold-endurance records. It combines three practices — a specific breathing exercise, progressive exposure to cold, and a mindset or commitment component — into a single routine intended to be repeated regularly.
Two things are worth establishing before anything else.
First, when people say "Wim Hof breathing" or "the Wim Hof breathing technique," they almost always mean one specific exercise: the cycles of rapid deep breathing and breath retention described below. When they say "the Wim Hof Method," they mean all three pillars together. The terms get used interchangeably online, which causes real confusion when reading research — several studies trained participants in the breathing only, and their results say nothing about cold exposure.
Second, the method is a practice, not a treatment. It is taught as something you do repeatedly over time, and most of the research follows participants for days or weeks, not years. That short timeframe shapes what the evidence can and cannot tell us, which is the subject of the science section further down.
The 3 Pillars of the Wim Hof Method
The method is usually described as a tripod. Each leg is a distinct practice with its own research literature, its own risks, and its own learning curve. Treating them as one undifferentiated thing is the most common source of confusion about what the method does.
Breathing
Rounds of rapid full breaths followed by a breath hold. Seated or lying down, 10 to 20 minutes.
Cold exposure
Gradual, progressive cold — most often the last seconds of an otherwise warm shower.
Mindset
Focused attention, tolerance of discomfort, and the commitment to repeat the practice.
The three pillars are separate practices. Evidence for one does not transfer to the others.
Pillar one: breathing
The breathing exercise is the entry point for most people and the component most often studied. It consists of rounds of rapid, full breaths followed by a breath hold on the exhale, then a recovery hold on a full inhale. It is done seated or lying down, usually in the morning, and a full session takes 10 to 20 minutes. The detailed protocol is in the next section, and matches the technique as described officially by the Wim Hof Method.
Pillar two: cold exposure
Cold exposure in this method is meant to be gradual and progressive — typically starting with the last seconds of an otherwise warm shower, then extending over weeks. Ice baths appear in the popular image of the method, but they are the far end of a progression, not the starting point. Notably, the cold exposure and the breathing are separate interventions, and the research on each does not automatically apply to the other.
Pillar three: mindset and commitment
The third pillar is the least tangible and the hardest to study. It refers to focused attention, a willingness to stay with discomfort rather than escape it, and — most practically — the commitment to repeat the practice regularly. It is difficult to isolate in a trial, and it is largely absent from the experimental literature. That does not make it unimportant; it means we have almost no controlled evidence about it specifically.
Free companion guide · PDF
The Beginner's Guide to Breathwork, Cold Exposure & Mindset
Understanding the principles popularized by the Wim Hof Method — restructured as a practical guide you can print, follow and revisit.
- A one-page breathing reference
- A four-week consistency framework
- A clear cold-exposure overview
- Safety guidance and common beginner mistakes
- A printable 28-day practice tracker
Free, no sign-up. The full method is explained in this article — the guide is the practical version.
How Does Wim Hof Breathing Work?
The mechanism is more interesting — and more specific — than the usual description of "getting more oxygen." Here is what is actually happening.
The breathing cycle
One round has three parts. First, a series of 30 to 40 deep breaths in a continuous rhythm, inhaling fully and letting the exhale fall out without forcing it. Second, after the final exhale, a breath hold with empty lungs, held until you feel a clear urge to breathe. Third, a full recovery inhale held for roughly 15 seconds, then released. That is one round. Three or four rounds make a session.
- 1 · Rapid breaths — 30 to 40 full breaths in rhythm
- 2 · Exhale hold — until a clear urge to breathe
- 3 · Recovery hold — one full inhale, about 15 seconds
One round. Most sessions repeat this three or four times.
Hyperventilation and carbon dioxide
This is the part that gets misreported most often. In a healthy person at rest, blood oxygen saturation is already close to its ceiling — typically 97 to 99 percent. Breathing harder cannot meaningfully raise a number that is already nearly at maximum.
What deliberate over-breathing does change substantially is carbon dioxide, which drops. Lower blood CO₂ raises blood pH slightly, a state called respiratory alkalosis. Two things follow. Tingling in the hands, feet, or face is a recognized consequence of this shift. And because the urge to breathe is driven largely by rising CO₂ rather than falling oxygen, lowering CO₂ first delays that urge — which is why the breath hold afterward can last far longer than most people expect.
That delay is the mechanism, and it is also the risk. The signal that normally tells you to breathe has been temporarily muted while oxygen continues to fall. In a chair, that is uncomfortable. In water, it is the mechanism behind hypoxic blackout — which is why the location rule above is not a formality.
The breath retention
During the hold, blood oxygen saturation falls — the ordinary consequence of not breathing. The practice therefore involves brief, repeated periods of lower oxygen rather than extra oxygen. Whether repeated exposure to that pattern produces meaningful long-term adaptation in healthy people is an open research question, not a settled one.
What you may feel
Commonly reported during practice: tingling in the extremities or around the mouth, light-headedness, a sensation of warmth or of cold, involuntary muscle twitching, emotional release, and occasionally mild cramping in the hands. These are largely explained by the CO₂ changes described above. They are sensations, not a scoreboard — feeling more of them does not indicate a stronger effect, and feeling few of them does not mean you are doing it wrong.
How to Do Wim Hof Breathing
Before you start
Sit or lie down somewhere it would be safe to faint. Never in or near water, never while driving, never standing. If you feel unwell at any point, stop and breathe normally. This is a general description of a widely practiced technique, not medical advice or a treatment for any condition.
- Get into position. Sit in a chair with back support, or lie on your back. Loosen anything tight around your waist or chest. Do this on an empty or light stomach if you can — most people practice in the morning.
- Take 30 to 40 deep breaths. Inhale fully through the nose or mouth, filling the belly and then the chest. Let the exhale go without pushing it out. Keep a steady rhythm. You may start to feel tingling or light-headedness — this is expected.
- Exhale and hold. After the final breath, exhale and stop, with your lungs comfortably empty. Hold without straining, until you feel a definite urge to breathe. Do not compete with a timer or with anyone else.
- Take a recovery breath. Inhale fully and hold that breath for roughly 15 seconds, then release. Some people notice a distinct settling here.
- Repeat for three or four rounds. Retention times often lengthen across rounds. That is normal and is not a measure of progress or health.
- Finish and rest. Return to normal breathing and stay seated or lying down for a couple of minutes before standing. Do not go straight into a cold shower on your first sessions — see the cold exposure section below.
A full session is 10 to 20 minutes. Most people practice once a day; some practice every other day. Frequency has not been systematically compared in research, so treat any specific recommendation — including this one — as convention rather than evidence.
What Happens to Your Body During Wim Hof Breathing
Several changes have been measured directly during this style of breathing. They are worth listing plainly, because they are the factual basis on which much broader claims are usually built.
Blood carbon dioxide falls during the rapid breathing phase, and blood pH rises accordingly. This is the well-understood consequence of voluntary hyperventilation and explains most of the sensations people report.
Blood oxygen falls during the retention phase and recovers on the following breaths, producing a repeated pattern of transient low oxygen.
Sympathetic nervous system activity increases. In the most-cited experimental work on the method, trained participants showed a marked rise in plasma epinephrine (adrenaline) during the breathing exercise — a stress-system activation produced voluntarily, which is genuinely unusual and is the finding that made the research notable in the first place.
Certain signaling molecules shift. In that same experimental setting, the trained group showed higher levels of the anti-inflammatory cytokine IL-10 and lower levels of several pro-inflammatory cytokines following an immune challenge. What that does and does not mean is the subject of the next two sections.
- Carbon dioxide — falls sharply during the rapid breathing
- Blood oxygen — stays near its normal ceiling, then falls during the hold
Illustrative, not measured study data. The breathing lowers carbon dioxide; it does not raise blood oxygen above normal resting levels.
The principle that governs the rest of this article
An acute physiological effect is not automatically a long-term health benefit. A measurable change during or shortly after a practice tells you the practice does something to the body. It does not, on its own, tell you that repeating the practice improves health over months or years. Nearly every overstated claim about this method comes from collapsing those two things into one.
What the Science Supports — and What It Doesn't
The evidence base for the Wim Hof Method is real but small. A 2024 systematic review examining physiological and psychological outcomes concluded that the available research is limited and methodologically constrained. Most studies involve a few dozen participants, most participants are young and healthy, most follow-up periods are days or weeks, and blinding a breathing exercise is close to impossible. That does not make the findings worthless. It does mean the honest summary is narrower than the popular one.
The table below separates four things that are usually presented as one: what has been directly demonstrated, what is promising but preliminary, what has not been adequately tested, and what has been overstated in the retelling.
| Claim | Evidence level | What research actually found | What we cannot conclude |
|---|---|---|---|
| Raises adrenaline voluntarily | Supported acute effect | Trained participants showed a pronounced rise in plasma epinephrine during the breathing exercise. | That this rise is beneficial, or that it persists between sessions. |
| Alters the response to an injected inflammatory trigger | Supported acute effect | In a controlled endotoxin experiment, trained participants showed higher IL-10, lower pro-inflammatory cytokines, and fewer flu-like symptoms than controls. | That the method reduces inflammation in everyday life, or affects any inflammatory condition. |
| Lowers carbon dioxide and changes blood pH | Supported acute effect | A well-established, uncontroversial consequence of voluntary hyperventilation. | That this shift produces a health benefit of any kind. |
| Improves mood or stress-related measures | Promising but preliminary | A randomized controlled trial has examined the method in women with elevated depressive symptoms; the wider literature on self-reported wellbeing outcomes remains small and inconsistent. | That it treats, prevents, or manages any diagnosed condition. It is not a mental health intervention. |
| Improves tolerance of cold | Promising but preliminary | Repeated cold exposure is generally associated with habituation over time. | That tolerance of cold equals a health benefit, or that habituation transfers to other outcomes. |
| Improves sleep, blood pressure, or cardiovascular health | Insufficient evidence | Not adequately tested for these outcomes in the Wim Hof Method literature. | Any conclusion in either direction. Absence of evidence is not evidence of absence. |
| Increases lung capacity | Insufficient evidence | Longer breath holds reflect lowered CO₂, not a structural change in the lungs. | That the practice enlarges lung capacity. |
| "Floods the body with oxygen" | Misleading | Resting saturation is already near maximum; blood oxygen falls during retention. | This claim is not supported by the physiology and should be retired. |
| "Boosts the immune system" | Overstated | The underlying study measured dampening of an induced inflammatory response — closer to the opposite of "boosting." | That it strengthens immunity, prevents illness, or protects against infection. |
| "Detoxes" or "alkalizes" the body | Unsupported | No mechanism and no evidence. Blood pH is tightly regulated and transient changes are corrected within minutes. | Nothing to conclude — the claim has no basis. |
Scroll horizontally to see the full table →
Read the first and last groups together. The genuinely interesting finding — that people can voluntarily influence an autonomic and immune response usually considered involuntary — is more remarkable than most of the marketing built on top of it. The marketing weakened a good result by overselling it.
Does Wim Hof Breathing "Boost" the Immune System?
This is the claim that travels furthest from its source, so it is worth walking through what the study actually did.
In the best-known experiment, published in PNAS in 2014, healthy young male volunteers were trained in the method for around ten days. They and an untrained control group were then injected with a bacterial endotoxin — a standard laboratory way of provoking a short, controlled inflammatory reaction that produces temporary flu-like symptoms. The trained group performed the breathing exercise around the injection. Compared with controls, they showed higher levels of the anti-inflammatory cytokine IL-10, lower levels of several pro-inflammatory cytokines, and reported fewer flu-like symptoms.
Now the distinction that matters.
Two different statements
"Modulating an experimentally induced inflammatory response" means: when researchers deliberately provoked a short inflammatory reaction in a laboratory, trained participants' reaction was smaller.
"Boosting the immune system" means: the immune system works better in general — you catch fewer colds, fight infection more effectively, recover faster.
The first was measured. The second was not. And the direction of the finding is closer to turning an inflammatory response down than to turning immunity up — which is not obviously desirable in every context, since inflammation is part of how the body fights infection.
Three further limits are worth stating plainly. The participants were young, healthy men, so the result does not automatically extend to women, older adults, or people with health conditions. The sample was small — a few dozen people. And an injected endotoxin is a controlled laboratory model, not a real infection.
None of this makes the finding trivial. Demonstrating voluntary influence over a response long assumed to be beyond conscious control is a legitimately significant result. It is simply a different result from the one printed on most websites.
Cold Exposure and the Wim Hof Method
Cold exposure is the second pillar and is frequently conflated with the first. They are separate practices with separate evidence.
Most of the research often cited for "cold exposure benefits" is not Wim Hof Method research at all — it is general cold-water or cold-shower research. A large randomized trial of routine cold showering, for example, reported a reduction in self-reported sickness absence from work in the cold-shower group, while the number of sick days when people were ill did not differ. That is an interesting result about cold showers. It says nothing about the breathing exercise, and nothing about the two combined.
Practical cold exposure notes
Start at the end of a normal warm shower: turn the water cold for a short period, breathe calmly, and get out. Extend by small increments across weeks. Cold water causes an involuntary gasp reflex and a sharp rise in heart rate and blood pressure on entry — which is why cold-water immersion warrants medical advice first if you have a heart condition, high blood pressure, or a history of fainting, and why open water is a different risk category entirely from a shower.
And to restate the rule that matters most: do not do the breathing exercise in the shower, in a bath, or in any body of water. The two pillars are practiced separately, in separate places. This is consistent with the official Wim Hof Method precautions.
7 Things Beginners Should Know Before Trying the Wim Hof Method
If you take nothing else from this guide, take these.
-
The breathing changes carbon dioxide, not oxygen
You are not loading up on oxygen — resting saturation is already near its ceiling. You are lowering CO₂, which is why the breath hold lasts so long and why your hands tingle. Understanding this one point corrects most of what is wrong online about the method.
-
More is not automatically better
Longer holds, more rounds, and more sessions are not a progress bar. Retention time mostly reflects how much CO₂ you have blown off, not how healthy or advanced you are. Extending sessions to chase a number adds risk without any evidence of added benefit.
-
Feeling light-headed is not proof that it is working
Tingling, dizziness, and twitching are predictable consequences of altered blood chemistry. They are signs the physiology is shifting — not evidence of a health effect. Intensity of sensation and size of benefit are unrelated.
-
Never practice in or near water
The breathing suppresses the urge to breathe while oxygen keeps falling. That combination is the mechanism behind hypoxic blackout, and it is why this technique and water must never be combined — not in a bath, not in a pool, not in the shower, not in open water. This rule has no exceptions and no advanced version.
-
The breathing and the cold are different interventions
They are studied separately, they carry different risks, and evidence for one does not transfer to the other. Treat them as two practices you happen to do in the same week, not one thing.
-
The research is genuinely interesting and genuinely limited
Small samples, mostly young healthy adults, short follow-ups, and very little blinding. The finding that people can voluntarily influence an autonomic and inflammatory response is real and notable. The list of health benefits built on top of it mostly is not.
-
Consistency beats intensity
Whatever this practice can offer, it comes from doing a modest version regularly rather than an extreme version occasionally. Ten calm minutes most mornings will always beat one ice bath and a story about it.
How Beginners Can Approach the Method
A reasonable first month, assuming you have cleared it with a healthcare professional if any of the earlier cautions apply to you.
Start smaller than you think you should
Two rounds instead of four. Twenty breaths instead of forty. Stop the hold at the first clear urge to breathe rather than pushing past it. The goal of the first two weeks is familiarity with the sensations, not performance.
Breathing
Same time each day, ideally morning, always seated or lying down. Build from two rounds to three or four over two to three weeks. If a session leaves you feeling unwell rather than settled, shorten it or skip a day — there is no evidence that pushing through produces anything useful.
Cold exposure
Separately, and later. Add a short period of cold at the end of a warm shower, breathing slowly and calmly rather than performing any breathing exercise. Extend gradually across weeks. There is no need to reach ice baths, and no evidence that you should.
Consistency
Four short sessions a week that you actually complete are worth more than a demanding routine you abandon in nine days. The most reliable predictor of whether a practice does anything for you is whether you are still doing it in three months.
Practice from paper, not from a scroll
Take the protocol with you
The printable guide keeps the breathing reference, safety guidance and tracker in one place.
A Broader Lesson: Systems Over Isolated Hacks
Step back from the specifics and the most useful thing about this method may not be its physiology at all. It is its shape.
The Wim Hof Method is not a single intervention. It is a small set of ordinary actions, performed in the same order, most days, for a long time. The breathing takes ten minutes. The cold takes thirty seconds. Neither is dramatic in isolation. What people describe as valuable is almost always the accumulation — the fact that they did it again this morning, and the morning before that.
That shape is easy to lose in a culture that packages wellness as discrete hacks: the protocol, the biohack, the thing you try once and post about. The evidence in this article points fairly consistently in the other direction. Acute effects are measurable and mostly short-lived. Whatever durable value exists, if it exists, comes from repetition.
This is the principle ESISLABS is built around, and it predates any particular practice: a system you keep is worth more than an intervention you abandon. Focus, calm, and recovery are not events. They are the residue of what you do repeatedly.
From ESISLABS
ESIS Mode — our own daily system
ESIS Mode is how ESISLABS organizes daily supplementation around three ordinary parts of the day: Focus Mode for working hours, Calm Mode for winding down, and Sleep Mode for the night.
The connection to this article is about routine and repeatability — not physiology. Breathwork and cold exposure are not part of ESIS Mode.
Focus · Calm · Sleep
Explore ESIS ModeTransparencyESIS Mode is not part of, affiliated with, or endorsed by the Wim Hof Method. Research described in this article does not constitute evidence for ESISLABS products.
Frequently Asked Questions
What is Wim Hof breathing?
A structured breathing exercise of repeated rounds — 30 to 40 rapid deep breaths, then a breath hold on the exhale, then a 15-second hold on a full inhale. It is one of three components of the wider Wim Hof Method, alongside gradual cold exposure and a mindset element.
How do you do Wim Hof breathing?
Sitting or lying down somewhere safe, take 30 to 40 full breaths in a steady rhythm, exhale and hold until you feel a clear urge to breathe, then take a full recovery breath and hold it for around 15 seconds. Repeat for three or four rounds. Never practice in or near water, while driving, or standing.
What are the three pillars of the Wim Hof Method?
Breathing, gradual cold exposure, and mindset or commitment. They are separate practices with separate risks and separate evidence — findings about one do not transfer to the others.
How long should you practice Wim Hof breathing?
A typical session is 10 to 20 minutes, most commonly once a day. Session length and frequency have not been systematically compared in research, so any specific recommendation is convention rather than evidence.
Does Wim Hof breathing increase oxygen?
No, and this is the most common misunderstanding. Resting blood oxygen saturation is already near maximum in healthy people, and it actually falls during the breath hold. What the breathing lowers substantially is carbon dioxide.
Does Wim Hof breathing reduce inflammation?
In one controlled laboratory experiment, trained participants showed a reduced response to a deliberately injected inflammatory trigger. That is a specific finding in a specific setting. It does not establish that the practice reduces inflammation in everyday life or affects any inflammatory condition.
Does Wim Hof breathing boost the immune system?
The research does not support that phrasing. What was measured was the dampening of an induced inflammatory response — closer to turning a response down than to strengthening immunity. There is no evidence that the method prevents illness or protects against infection.
Is Wim Hof breathing safe?
It can cause light-headedness and fainting, so safety depends heavily on where you practice: seated or lying down, never in or near water, never while driving or standing. Anyone who is pregnant, has a heart or respiratory condition, high blood pressure, or a history of fainting or seizures should speak with a qualified healthcare professional first.
Can beginners do the Wim Hof Method?
The breathing is commonly practiced by beginners, provided the location rules are followed and the starting volume is modest — two rounds rather than four is a reasonable start. Cold exposure should begin with a short period at the end of a warm shower, not with an ice bath.
Should you do the breathing before cold exposure?
The two pillars are taught as separate practices, and the breathing must never be done in or near water — including in a shower. Practice the breathing seated or lying down, and treat any cold exposure as a separate event in a separate place.
Where to Go From Here
You now have the method, the mechanism, the safety rules, and an honest read of the evidence. The only thing left is doing it on a morning when you would rather not — which is a different problem, and the one the free guide is designed for.
Free · PDF
The Beginner's Guide to Breathwork, Cold Exposure & Mindset
A one-page breathing reference, a four-week consistency framework, a cold-exposure overview, safety guidance, and a printable 28-day tracker.
Sources and Further Reading
- Kox M, van Eijk LT, Zwaag J, van den Wildenberg J, Sweep FCGJ, van der Hoeven JG, Pickkers P. Voluntary activation of the sympathetic nervous system and attenuation of the innate immune response in humans. PNAS. 2014;111(20):7379–7384.
- Buijze GA, Sierevelt IN, van der Heijden BCJM, Dijkgraaf MG, Frings-Dresen MHW. The effect of cold showering on health and work: a randomized controlled trial. PLOS ONE. 2016;11(9):e0161749.
- Blades R, Mendes WB, Don BP, et al. A randomized controlled clinical trial of a Wim Hof Method intervention in women with high depressive symptoms. Comprehensive Psychoneuroendocrinology. 2024;20:100272.
- Almahayni O, Hammond L. Does the Wim Hof Method have a beneficial impact on physiological and psychological outcomes in healthy and non-healthy participants? A systematic review. PLOS ONE. 2024;19(3):e0286933.
- Bart RM, Murray BP, Lau H. Shallow Water Blackout. StatPearls, NCBI Bookshelf.
- Wim Hof Method. Wim Hof breathing: the official technique. Referenced for the official description of the breathing exercise only.
- Wim Hof Method. Frequently asked questions. Referenced for official precautions and guidance only.
This article is for general educational purposes and is not medical advice. Breathing exercises involving hyperventilation and breath retention carry risks, including fainting. Never practice them in or near water, while driving, while operating machinery, or anywhere a loss of consciousness could cause harm. Consult a qualified healthcare professional before starting any breathing or cold exposure practice — particularly if you are pregnant, have a heart, respiratory or blood pressure condition, a history of fainting or seizures, or take prescription medication. ESISLABS is not affiliated with, endorsed by, or connected to Wim Hof or Innerfire BV. References to the Wim Hof Method are descriptive and for educational purposes only. These statements have not been evaluated by the Food and Drug Administration. ESISLABS products are not intended to diagnose, treat, cure or prevent any disease.
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