Cold Showers and Testosterone: What the Science Actually Says

Cold showers for testosterone have become a staple recommendation in the men's health space. Social media is full of claims that cold exposure will dramatically boost your testosterone, with influencers plunging into ice baths and promising hormonal transformation. But what does the actual research say?

The honest answer is more complicated than the headlines suggest. Cold exposure has real physiological effects, but a direct cold-to-testosterone pipeline is not backed by good evidence. Let us break down what we actually know.

What Cold Exposure Does to Your Body

When your body is exposed to cold temperatures, it triggers a cascade of physiological responses collectively known as the cold shock response. Understanding these responses is key to evaluating the testosterone claims, because most of the documented effects of cold exposure operate through the sympathetic nervous system rather than through testosterone production.

The best-documented response is a large increase in norepinephrine (also called noradrenaline), a neurotransmitter and hormone that affects alertness, focus, mood, and vasoconstriction. In one laboratory study, young men sat in water up to the neck for a full hour. At 14C (57F), their metabolic rate rose by about 350%, plasma noradrenaline by about 530% and dopamine by about 250%, while cortisol tended to decrease rather than rise.^[1]

These are real, measurable effects, but note the conditions: a full hour in cold water is a much larger stimulus than a typical cold shower, so the numbers should not be applied to a 2-minute rinse. A follow-up study found that three weekly immersions over six weeks did not clearly change how reactive the sympathetic nervous system was.^[5]The question is whether any of these responses translate into meaningful testosterone changes. The evidence says: not shown.

The Direct Evidence: Cold and Testosterone

Here is where we need to be straightforward: we did not find controlled human trials showing that cold showers or ice baths raise testosterone.

What does exist points the other way or shows no effect. In one crossover study of 11 endurance-trained men, a single 3-minute session of whole-body cryotherapy at minus 110C after hard running did not change testosterone, cortisol or inflammatory markers compared with passive recovery.^[6] And a 2026 narrative review on testosterone-optimizing strategies in athletes concluded that cold-water immersion may decrease testosterone, while sauna bathing appears neutral.^[2] That review is a low-level narrative review, so treat it as a caution rather than a proven effect.

Possible Indirect Benefits

If cold exposure helps you at all, the more plausible routes are indirect, and most of them are still being studied:

1. Stress and Mood

Cold exposure is a form of hormesis, a brief, controlled stressor. A 2026 systematic review of 13 studies (4,105 participants) found pooled estimates that generally favored cold-water exposure for mood, perceived stress and wellbeing, but the confidence intervals were wide, most studies had a high risk of bias, and the authors concluded that the evidence does not establish a benefit.^[8] Since chronic stress and testosterone are linked, any real stress benefit could matter indirectly, but that chain is speculative.

2. Sleep

Some people report sleeping better after cold exposure. The same 2026 review found sleep outcomes were sparse, though generally favorable.^[8] Because sleep quality is a well-established influence on testosterone, this is the most plausible indirect link, but cold exposure is not a proven sleep aid.

3. Fewer Sick Days (Self-Reported)

In a randomized trial of 3,018 adults aged 18 to 65, participants ended their normal shower with 30, 60 or 90 seconds of cold water for 30 days, then continued at their own discretion for 60 more days. The cold shower groups reported 29% less sickness absence from work than controls, but there was no significant difference in the number of illness days.^[3] Note that sickness absence is a self-reported behavior outcome, not a measure of immune function or hormone levels.

Cold Exposure Methods Compared

The research mostly uses either short cold-shower finishes or longer water immersion, and the two are not interchangeable.

Cold Showers

Cold showers are the most accessible form of cold exposure. They require no equipment and fit into an existing routine. In the large randomized trial above, participants simply finished a warm shower with 30 to 90 seconds of cold water.^[3] The limitation is that tap temperature varies by location and season, so the stimulus is less standardized than immersion.

Ice Baths and Cold Plunges

Full-body cold water immersion contacts your entire body at once and produces a stronger stress response than a shower, as the 14C immersion data show.^[1] The downside is logistics and safety: you need a tub, ice and time, cold shock can strain the heart and breathing, and as discussed below, regular use right after lifting may blunt training gains.^[4]

Whole-Body Cryotherapy

Cryotherapy chambers expose you to extremely cold air (around minus 110C in the study above) for a few minutes. In that crossover study, a 3-minute session did not alter hormonal, inflammatory or muscle damage markers compared with passive recovery.^[6] It is expensive, and we did not find evidence that it raises testosterone.

If You Want to Try It: A Gentle Progression

There is no evidence-based cold exposure dose for testosterone. If you want to try cold showers for alertness or as a habit, the progression below is a cautious way to build tolerance, anchored to the 30 to 90 second range used in the large randomized trial.^[3] It is a practical suggestion, not a treatment protocol.

Who Should Be Careful with Cold Exposure

Cold exposure is a physical stressor. Speak with a doctor before trying it if you have any of the following, and consider avoiding it:

• Cardiovascular conditions: Cold raises heart rate and blood pressure (in the immersion study above, heart rate rose about 5% and blood pressure about 7 to 8%).^[1] Men with heart conditions, high blood pressure, or a history of cardiac events should check with their doctor first.
• Raynaud's disease: Cold can trigger painful vasospasms in the extremities in people with this condition.
• Cold urticaria: A rare condition where cold exposure triggers hives and, in severe cases, a serious allergic reaction.
• Any other medical condition or medication: If you are unsure, ask your doctor before starting. Never swim or bathe in very cold water alone.

The Honest Verdict

Cold exposure is a legitimate practice with measurable acute effects on norepinephrine and dopamine, and some people enjoy it as a wake-up or discipline habit. But the specific claim that cold showers directly and meaningfully increase testosterone is not supported by the evidence we found, and the broader mood and wellbeing evidence is still limited and at high risk of bias.^[8]

If you are doing cold exposure solely for testosterone, your time is better spent on sleep, resistance training, and nutrition, which have far stronger evidence. If you enjoy cold showers, you can include one in your daily routine as a supporting habit. On the opposite end of the thermal spectrum, see our article on sauna use and testosterone, and for another unconventional approach, grounding and earthing.

How Thrive Helps

Thrive lets you track daily habits such as cold exposure alongside your sleep, training, nutrition and stress habits as part of your overall wellness routine. Try Thrive free. Thrive is a wellness app, not a medical device, and does not diagnose or treat any condition. If you have symptoms such as persistent fatigue or low libido, talk to a doctor.