Regular sauna use has been shown to support and strengthen the immune system in several important ways. The heat exposure raises the body's core temperature, mimicking a mild fever, which can stimulate the production of white blood cells, your body's natural defense against infections. This process, often called hyperthermic conditioning, helps the immune system respond more efficiently to pathogens.  A study by the University of Eastern Finland (2017) showed that people who used a sauna 4 to 7 times per week had significantly fewer colds and flu episodes compared to those who used saunas less frequently. Another comprehensive review published in Mayo Clinic Proceedings highlights that sauna use may improve immune function through its anti-inflammatory and stress-reducing effects.  Taken together, these effects make regular sauna use a powerful addition to a wellness routine aimed at keeping your body resilient and strong.