New comprehensive analysis of the literature by @LaukkanenJari shows frequent sauna use may reduce the risk of heart disease, neurocognitive diseases.
New comprehensive analysis of both prospective studies and clinical trials shows frequent sauna use may reduce the risk of heart disease, neurocognitive diseases, mental health disorders, pulmonary diseases, and mortality.
Temperature, duration, and frequency are in the review. Most of the studies show benefits with a sauna temperature of around 174F for 20 minutes at least 2-3 times per week. Sauna use 4-7 times per week had the most robust effects.
This review is authored by Dr. Jari Laukkanen. His research has shown that frequent sauna bathing reduces blood pressure, inflammation, oxidative stress, cholesterol, arterial stiffness, and vascular resistance. He has also shown that sauna use contributes to beneficial levels of circulating hormones and other cardiovascular markers.

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You can learn more about the beneficial effects of sauna use on the heart and brain by checking out my podcast with the author of this study, Dr. Jari Laukkanen.
Sauna episode: https://www.foundmyfitness.com/episodes/jari-laukkanen