Is ice bathing healthy? What the science really says

Hardly any wellness trend has shaped the past few winters quite like cold bathing. But the key question keeps coming up: Is ice bathing healthy—or is the hype surrounding cold plunges and winter swimming mostly just good marketing? The honest answer lies somewhere in between. There are promising studies, but also significant gaps in research and serious risks to consider.

In this how-to guide, we objectively assess the current body of research, explain what happens to your body when you immerse yourself in an ice bath, and show you, step by step, how to safely take your first Cold Plunge. We’ll also clarify at what temperature ice bathing actually begins, how often it’s worth doing—and how much it costs to set up your own Cold Plunge at home.

Important note: This article is not a substitute for medical advice. Especially those with pre-existing conditions should be aware of the risks before jumping on this trend.

Is ice bathing healthy? Here’s what science says

The most comprehensive evaluation to date was published in January 2025: A systematic review with a meta-analysis conducted by the University of South Australia evaluated 11 studies involving a total of 3,177 participants. The result: Cold-water immersion can reduce stress, improve sleep quality, and enhance quality of life (ScienceDaily / University of South Australia).

That sounds convincing—but the same researchers explicitly emphasize that there is currently not enough high-quality research to determine who benefits the most or what the ideal approach is. They are calling for further long-term studies involving more diverse groups.

Independent fact-checkers take an even more critical view. The website medizin-transparent.at concludes that studies on ice bathing to date have methodological flaws and often have not directly tested the purported health benefits (medizin-transparent.at).

Swiss cold researcher Erich Hohenauer also found no demonstrable effect on resting heart rate, blood pressure, or the immune system in his studies—but he did observe a positive change in subjective well-being (SRF Wissen).

Many popular health articles still rely on a single Finnish study from 2004 involving 49 winter swimmers and 33 non-swimmers. The study found an improvement in overall well-being—the participants entered the ice-cold water an average of four times a week (FITBOOK).

Conclusion based on the evidence: The data regarding subjective well-being is quite encouraging. However, the evidence for hard physical markers such as immune system strengthening or blood pressure is limited. Ice bathing is therefore not a miracle cure—but it is also more than just a placebo effect.

What Happens to the Body During Ice Bathing

As soon as you step into cold water, your body reacts reflexively. The blood vessels in your skin constrict, and blood flows back toward your torso. According to Barmer, it is precisely this constriction that subsequently stimulates blood circulation and has a positive effect on the cardiovascular system, while the body maintains a stable core temperature of 36–37 °C (Barmer Health Insurance).

It is interesting to note that these cold-induced reactions do not begin at 0 °C. Various physiological reactions occur even at water temperatures below 15 °C and resemble the reactions at 0 °C in both pattern and severity (MeinMed.at).

The Immune System and Brown Fat

The health insurance provider IKK classic points out that studies have shown that regular bathing in ice-cold water leads to a significant increase in white blood cell count—the recommended frequency is once or twice a week (IKK classic).

A randomized controlled trial published in the Journal of Thermal Biology (October 2024) examined the effects of regular cold showers and found evidence of effects on humoral and cell-mediated immunity—moderate at the outset, more pronounced after 2–3 months (Wim Hof Method).

Brown adipose tissue is particularly interesting for weight loss: cold activates this tissue, causing it to burn fat and sugar. According to SRF, large-scale studies have shown that people with more brown fat have a lower risk of type 2 diabetes (SRF Wissen). However, there is no evidence that ice bathing alone leads to significant weight loss.

What temperature and for how long? The right values

According to the official definition—as used in ice swimming competitions, for example—the term “ice bath” refers to water temperatures below 5 °C (ÖKO-TEST). However, as mentioned, the sensation of cold begins to be felt even at temperatures below 15 °C.

When it comes to duration, less is more. Short Cold Plunges lasting less than ten minutes primarily trigger a stimulating stress response—though researchers emphasize the urgent need for further research in this area as well (Spermidin-Plus Magazine).

For noticeable positive effects, regularity is more important than duration. Specialized websites recommend about two sessions per week; a single cold-water bath therefore has no significant health benefits (MeinMed.at).

The difference between a cold shower and Cold Plunge real Cold Plunge lies in the temperature and the threshold at which the effects are felt. A cold shower is the ideal first step before you venture into water below 5 °C.

Ice Bathing Before or After Exercise

It’s worth making a clear distinction here that many articles overlook. For endurance athletes, cold-water immersion after training can aid recovery from fatigue—as demonstrated by a meta-analysis published in *Frontiers in Physiology* (Xiao et al., 2023) (*Frontiers in Physiology*).

For strength athletes, the situation is different: According to recent studies, Cold Plunges immediately after strength training can inhibit new muscle growth because the cold reduces the muscles’ ability to store new proteins that are essential for muscle growth (BE BRAVE).

Practical tip: If you want to build muscle, make sure to leave a significant amount of time (ideally 48 hours) between strength training and Cold Plunge—or schedule the Cold Plunge for a day when you’re not working out. If your goal is purely recovery after a long endurance workout, taking a cold bath afterward can be beneficial.

How to Take Your First Cold Plunge: Step by Step

As a general rule of thumb for beginners: safety comes before courage. Take it slow instead of submerging yourself for minutes at a time on your first try.

1. Get a medical checkup first. Before taking your first Cold Plunge, a cardiological examination is recommended, especially if you have a history of cardiovascular disease (Barmer).
2. Get used to cold showers. Start with alternating hot and cold showers before stepping into Cold Plunge real Cold Plunge below 5 °C.
3. Never alone (buddy system). Always have a second person nearby who can intervene.
4. Step in calmly and breathe mindfully. Step in slowly, control your breathing, and avoid frantic hyperventilation.
5. Keep it short. To start with, 30 to 60 seconds is enough; as long as it’s under ten minutes, the session remains a stimulating experience.
6. A clear exit plan. Decide in advance when you’ll get out, and then actively warm up afterward with dry clothes and movement—not by taking a hot shower right away.

For beginners, a controlled ice bath tub or chill tub at home is often safer than a natural lake: You know the temperature, have a firm footing, and can get out at any time.

Risks and Contraindications

As tempting as this trend may be, ice bathing isn’t for everyone. The most dangerous moment is the so-called cold shock that occurs upon immersion.

According to Dr. Ursula Marschall, chief medical officer at Barmer, ice bathing can lead to arrhythmias or even cardiac arrest in people with pre-existing cardiovascular conditions due to the cold shock (Barmer).

ÖKO-TEST strongly advises older adults and Persons with cardiovascular diseases, high blood pressure, cardiac arrhythmias, vascular diseases, asthma, epilepsy, or acute infections to seek medical advice beforehand or to refrain from using these products altogether (ÖKO-TEST).

According to health guides, pregnant women should avoid ice baths entirely, as the extreme cold poses risks to both mother and child (Spermidin-Plus Magazine).

If you don’t belong to any of these groups and are just starting to explore these options, the benefits generally outweigh the risks for healthy individuals. When in doubt, always consult your doctor first.

Cold Plunge at Home: Barrel, Chill Tub, and Costs

If you want to take ice baths regularly—that is, twice a week—you need a reliable solution. Simple ice bath barrels use ice cubes, but they’re time-consuming to use on a daily basis. A more convenient option is a cold plunge with a chiller that keeps the water temperature constant—precisely between 3 and 10 °C.

You should plan your budget realistically. Standalone cooling units for cold-plunge pools start at around €800 on the market, while complete systems consisting of a pool and cooling unit start at around €5,900. In addition, there are ongoing electricity costs of about €30–150 per month, depending on the model and frequency of use (Eisbad-Ratgeber.de).

A popular topic among wellness enthusiasts is the contrast routine of alternating between a sauna and Cold Plunge. The rapid temperature change stimulates blood circulation—however, this specific alternation has not yet been extensively studied scientifically, so the same precautions apply as when taking an ice bath.

Frequently Asked Questions

Sources

• ScienceDaily / University of South Australia – The big chill: Is cold-water immersion good for our health?
• PLOS ONE – Effects of cold-water immersion on health and wellbeing (2025)
• Frontiers in Physiology – Xiao et al. 2023, Meta-Analysis of Cold-Water Immersion & Recovery
• Wim Hof Method – Study on Cold Showers and the Immune System (Journal of Thermal Biology, 2024)
• Barmer Health Insurance – Ice Bathing: How Healthy Is Winter Swimming, Really?
• IKK classic – Is ice bathing healthy or dangerous?
• SRF Wissen – Ice Baths: Healthy or Dangerous?
• medizin-transparent.at – Ice Bathing: A Fact Check
• ÖKO-TEST – How Healthy Are Ice Baths, and What Risks Do They Pose?
• FITBOOK – Ice Bathing: Health Benefits and Risks
• MeinMed.at – Ice Bathing & Cold-Water Swimming
• Spermidin-Plus Magazine – Ice Bathing: Benefits, Risks, and What Happens in the Body
• BE BRAVE – Ice Bathing After Exercise
• Cold PlungeRatgeber.de – Cold Plunge with a Cooling Unit: A Comparison of Systems