Does Sauna Increase Growth Hormone?

Growth hormone has become one of the most talked-about hormones in health and fitness. It's often linked to muscle growth, fat loss, faster recovery and even anti-ageing, leading some wellness influencers to claim that regular sauna use can naturally boost human growth hormone (HGH).

But how much of that is actually supported by science?

The short answer is yes—sauna bathing can temporarily increase circulating growth hormone levels under certain conditions. However, that doesn't mean it's a shortcut to building muscle or replacing exercise.

Here's what the research actually tells us.

What Is Human Growth Hormone?

Human Growth Hormone (HGH), also known as somatotropin, is produced by the pituitary gland and plays a vital role throughout life. It helps regulate growth during childhood and continues to support tissue repair, bone health, metabolism and muscle maintenance throughout adulthood.

Growth hormone is released naturally in pulses, with the largest surges typically occurring during deep sleep and after intense exercise. As we age, natural production gradually declines.

Can Sauna Increase Growth Hormone?

Research suggests that it can.

One of the landmark studies, published in the Journal of Applied Physiology, investigated the hormonal effects of repeated sauna bathing in healthy men. Researchers found that prolonged exposure to high temperatures produced significant temporary increases in circulating growth hormone immediately after sauna sessions.

The greatest response occurred after repeated bouts of sauna bathing rather than a single short exposure, suggesting that heat stress acts as a physiological stimulus for growth hormone release.

Since then, several studies have reached similar conclusions, with researchers consistently observing short-term elevations in growth hormone following sauna use.

Why Does Heat Trigger Growth Hormone?

Scientists believe the increase forms part of the body's natural response to heat stress.

As your core temperature rises, your heart rate increases and your body works harder to maintain a stable internal temperature. These changes activate the sympathetic nervous system and trigger several hormonal pathways, including the release of growth hormone.

Rather than acting as a muscle-building shortcut, this response appears to help support normal tissue repair and adaptation following physical stress.

Does More Growth Hormone Mean More Muscle?

This is where many online claims become misleading.

Although sauna bathing can temporarily increase growth hormone levels, there is currently no convincing evidence that sauna use alone leads to significant muscle growth or strength gains through this hormonal response.

Muscle development still depends primarily on:

• Progressive resistance training
• Adequate protein intake
• Sufficient calories
• Quality sleep
• Consistent recovery

The temporary increase in growth hormone is simply one part of a much larger physiological picture.

What Does the Research Actually Show?

One of the most frequently cited studies involved participants completing two one-hour sauna sessions at approximately 80°C, separated by a cooling period. Researchers observed a dramatic increase in circulating growth hormone compared with baseline levels.

However, it's important to put these findings into context.

Most people don't spend two hours in a sauna. A typical recreational session lasts between 15 and 30 minutes, meaning the hormonal response is likely to be smaller than that seen under laboratory conditions.

The amount of growth hormone released appears to depend on several factors, including:

• Sauna temperature
• Session length
• Number of heating cycles
• Individual fitness
• Hydration
• Previous heat adaptation

Sauna, Recovery and Athletic Performance

While growth hormone receives most of the attention, many sports scientists are more interested in the wider physiological effects of regular heat exposure.

Research has associated consistent sauna use with improvements in cardiovascular conditioning, heat acclimation, perceived recovery and sleep quality.

The American College of Sports Medicine also recognises heat acclimation as an important physiological adaptation for athletes, particularly those training or competing in hot environments. Although sauna bathing isn't a replacement for exercise, it may complement a well-structured training programme when used appropriately.

Improved sleep and recovery may ultimately have a greater influence on long-term athletic performance than the temporary hormonal spike itself.

Should You Use a Sauna After Exercise?

Many athletes choose to use a sauna after training as part of their recovery routine.

The heat may promote relaxation, encourage circulation and support recovery, provided you replace the fluids lost through sweating. Hydration remains essential, particularly after intense exercise.

Some endurance athletes also use post-exercise sauna sessions as part of structured heat adaptation programmes to prepare for competition in warmer climates.

Can Sauna Replace Exercise?

No.

Although sauna bathing produces several physiological responses that resemble moderate exercise—including an elevated heart rate and increased circulation—it does not create the mechanical stimulus required to build muscle or improve strength.

Think of the sauna as a recovery tool rather than a replacement for training.

Who Should Be Cautious?

Sauna bathing is generally well tolerated by healthy adults, but it isn't suitable for everyone.

Both the Mayo Clinic and Harvard Medical School advise that people with unstable cardiovascular conditions, uncontrolled blood pressure or other significant medical concerns should seek medical advice before using a sauna. They also emphasise the importance of staying hydrated, avoiding alcohol before sauna use and leaving the sauna immediately if you begin to feel unwell.

The Verdict

So, does sauna increase growth hormone?

Yes. Research published in the Journal of Applied Physiology demonstrates that sauna bathing can temporarily increase circulating growth hormone levels as part of the body's normal response to heat stress.

However, it's important to keep those findings in perspective. Current evidence does not support the idea that sauna use alone will dramatically increase muscle mass or replace the benefits of exercise. Instead, the temporary rise in growth hormone appears to be one component of a much broader physiological response that includes improved circulation, cardiovascular conditioning and recovery.

For most people, the greatest benefits of regular sauna bathing are still its well-established effects on cardiovascular health, relaxation, recovery and overall wellbeing. The increase in growth hormone is an interesting piece of the puzzle—but it's far from the whole story.