Sauna Benefits and Testosterone: What the Science Shows

Sauna Benefits and Testosterone: The Science and the Honest Answer

Does sauna benefit testosterone? The honest answer is that there is no good evidence that sauna raises testosterone. Sauna does cause short-term changes in other hormones, such as growth hormone and prolactin, and regular use is associated with better long-term cardiovascular health in Finnish men. But claims that sauna "boosts T" go beyond the research.

That distinction matters. If you are hoping a sauna will fix low testosterone, it will not. If you enjoy sauna and want to know whether it helps or harms your hormones, this guide sets out what the studies show.

What Most Men Are Actually Doing to Their Hormones

Chronic stress, poor sleep, low activity and excess body fat are all linked with lower testosterone, and testosterone gradually declines with age. If you have symptoms of low testosterone, speak to your GP, who can arrange a blood test.

A sauna habit can be part of a healthy routine alongside sleep, training and diet, but it is not a hormone treatment.

For the wider picture, see our guide to sauna benefits for men, which covers the stronger cardiovascular evidence.

What the Research Shows on Sauna and Testosterone

Several small studies have measured hormones before and after sauna sessions. Here is what they found.

Testosterone

In a 1986 study, men took two one-hour sauna sessions at 80°C every day for a week. Testosterone, LH and FSH did not change, while cortisol fell slightly (Leppäluoto et al., Acta Physiologica Scandinavica, 1986).

Another study exposed eight young men to very hot sauna conditions. Testosterone rose only in the most extreme condition (humid heat continued until exhaustion), and that was a short-lived change, not a lasting increase (Kukkonen-Harjula et al., European Journal of Applied Physiology, 1989). Neither study supports the idea that regular sauna raises testosterone.

Cortisol and Stress

Chronic stress can affect hormones, and many men find sauna relaxing. In the 1986 study, cortisol fell slightly during the week of sessions. However, there is no trial showing that regular sauna lowers cortisol enough to raise testosterone.

Stress management is worthwhile for many reasons. Sauna can be one part of that for people who enjoy it, but it should not be sold as a testosterone intervention.

Growth Hormone

The most dramatic short-term hormonal effect of sauna is on growth hormone (GH). In the 1986 study, GH rose 16-fold, but the protocol was two one-hour sessions a day for a week, the rise faded after day three, and the authors suggested it may relate to dehydration. Normal 10-20 minute sessions have not been shown to produce anything similar, and there is no evidence that sauna-induced GH improves body composition or muscle growth.

For performance and recovery, the better-documented sauna finding is about endurance: a small study of six runners found that post-training sauna for three weeks increased run time to exhaustion (Scoon et al., 2007). See our guide to sauna after a workout.

The Finnish Research Base: What Laukkanen's Work Actually Shows

The strongest human data on sauna and long-term health come from Jari Laukkanen and colleagues at the University of Eastern Finland. Their cohort studies did not measure testosterone, but they are the main reason sauna is taken seriously as a health habit.

A 20-year cohort study of 2,315 Finnish men (Laukkanen et al., JAMA Internal Medicine, 2015) found that using a sauna 4-7 times a week was associated with about a 50% lower risk of fatal cardiovascular disease and about 40% lower all-cause mortality than once a week. This is an association in men and does not prove sauna caused the difference. Good cardiovascular health matters for men's health generally, including erectile function, but these studies did not look at hormones.

For the full scope of this research, see our guide to sauna and longevity in Australia.

Does Sauna Lower Testosterone or Affect Fertility?

On testosterone, the short answer is no: the studies above did not find that sauna lowers it. Fertility is a different question.

Sperm production works best when the testes are a few degrees cooler than core body temperature. Studies have found that regular sauna use can temporarily reduce sperm production, which appears to recover after stopping (Garolla et al., Human Reproduction, 2013).

There is no evidence that a cold plunge after the sauna prevents this. If you and your partner are trying to conceive, the safest approach is to avoid or cut back on sauna use and speak to your doctor or a fertility specialist.

For men not trying to conceive, sauna has not been shown to harm testosterone. For the cardiovascular side of the story, read our guide to sauna and cardiovascular health in Australia.

The Cold Plunge: What It Does and Does Not Do

Many men pair sauna with a cold plunge. It has its own effects, but there is no evidence it raises testosterone either.

Cold water has a strong alerting effect. In a laboratory study, sitting in 14°C water for one hour raised blood noradrenaline about five-fold and dopamine about 2.5-fold (Šrámek et al., European Journal of Applied Physiology, 2000). Typical 2-5 minute plunges have not been shown to produce the same rise.

For strength athletes there is a caution: regular cold water immersion straight after strength training has been shown to blunt long-term gains in muscle mass and strength (Roberts et al., Journal of Physiology, 2015). Keep cold plunges away from heavy lifting sessions if muscle gain is your goal.

On recovery, a 2018 meta-analysis of 99 studies (Dupuy et al., Frontiers in Physiology) found that cold water immersion reduced muscle soreness and perceived fatigue after exercise, although massage was the most effective technique overall.

For the full evidence base, see our guide to sauna and ice bath benefits and our sauna cold plunge routine guide.

Building a Routine You Will Keep

Many men who buy a Genesis and Origin are looking for a daily routine for sleep, stress and training recovery. Having the setup at home is what makes regular use realistic.

The Genesis uses clear-grade Japanese cedar with no glue, MDF or wood filler, a 9 kW HUUM Drop heater with 60 kg of stones (or Harvia Vega), and blue-light-free amber and red lighting, which is gentler than bright white light for evening sessions.

For outdoor setups, with a sauna on the deck and a cold plunge beside it, outdoor installations need the optional Colorbond steel roof kit for the structural warranty (it is not fully waterproof in heavy rain). Our sauna and cold plunge guide covers setup options.

The Real Cost of a Home Sauna Routine in Australia

Running costs depend on your electricity tariff, how long you preheat (about 45-60 minutes for the Genesis) and how often you use it. The Origin's chiller also uses power. There are no per-visit fees.

Commercial saunas often have time limits, shared space and no cold plunge. A home setup lets you choose your own temperature and timing.

See the full breakdown in our home sauna cost guide for Australia.

In Queensland and coastal NSW, year-round outdoor sauna use is practical. Our outdoor sauna guide for Australia covers placement, weather and electrical requirements.

Traditional Sauna vs Infrared Sauna

Traditional Finnish saunas and infrared saunas work differently. Neither has been shown to raise testosterone. Here is a general comparison:

Psycle builds traditional Finnish saunas. The HUUM Drop heater option in the Genesis carries 60 kg of stones, which holds heat through multiple löyly pours. For a deeper comparison, see our guide on traditional vs infrared sauna.

A Sensible Sauna Routine

There is no proven sauna protocol for testosterone. The routine below is general guidance for enjoying sauna and cold safely; it is not derived from hormone research.

In the Finnish cohort, the lowest cardiovascular risk was seen with 4-7 sessions a week, but that is an association. Our guide on how often you should use a sauna covers frequency, and whether to sauna before or after your workout is worth reading before you set your schedule.

If you are newer to heat, our guide on how long to stay in a sauna gives you a progression framework, and our guide to sauna temperature in Australia covers how to set the heat.

Sauna, Mood and Sleep

Low mood, poor sleep and low testosterone can go together, which is one reason to speak to your GP if you are experiencing them.

Many men find sauna relaxing, and some find an evening session helps them wind down. A 2019 meta-analysis found that a warm bath or shower 1-2 hours before bed helped people fall asleep about 10 minutes faster (Haghayegh et al., Sleep Medicine Reviews); saunas were not tested, but the mechanism is similar. Read more in our sauna and mental health guide.

The real value of a home sauna is consistency: a routine you enjoy is one you will keep.

FAQ: Sauna Benefits and Testosterone

Does sauna increase testosterone?

There is no good evidence that it does. In a 1986 study of men taking two one-hour sauna sessions a day for a week, testosterone did not change. Another study found a short-lived rise only in extreme humid heat taken to exhaustion. Sauna does temporarily raise growth hormone and prolactin. If you are worried about low testosterone, speak to your GP.

Does sauna lower testosterone?

The available studies did not find that sauna lowers testosterone. However, regular sauna use can temporarily reduce sperm production, which appears to recover after stopping. If you are trying to conceive, speak to your doctor.

Is sauna good for male fertility?

Heat is not good for sperm production. Studies have found that regular sauna use can temporarily reduce sperm counts, which appear to recover after stopping. If you are trying to conceive, avoid or limit sauna and speak to your doctor or a fertility specialist. There is no evidence that a cold plunge afterwards protects fertility.

Is there a sauna routine for testosterone?

No proven routine exists, because sauna has not been shown to raise testosterone. For general health, a common approach is 10-20 minutes per round, 2-3 rounds, a few times a week, with plenty of water. The lowest cardiovascular risk in the Finnish cohort was seen with 4-7 sessions a week (an association).

How long does sauna take to affect hormones?

Short-term changes in growth hormone and prolactin happen during and soon after a session, and fade. There is no evidence of lasting changes to testosterone with regular use.

Is traditional sauna better than infrared for hormonal health?

For testosterone, neither has been shown to help. For long-term health outcomes, the Finnish cohort data come from traditional saunas, and there are no equivalent long-term infrared data.

Can sauna replace testosterone replacement therapy (TRT)?

No. Sauna is a lifestyle habit, not a hormone treatment. Men with low testosterone should be assessed by their GP or an endocrinologist. If you are on testosterone therapy, check with your doctor before starting a regular sauna routine.

For the complete picture of what traditional sauna is associated with, start with our evidence-based guide to sauna benefits in Australia. If you are planning a setup, our sauna buying guide for Australia covers electrical requirements, timber and delivery.

The men who get the most from a sauna are the ones who build the habit. A home sauna makes that habit easy to keep.