Sauna Seasoning: The Heat is On for Immune System Boosters The Finns have long prized their saunas as a sacred institution, and it seems they've been onto something all along.
A recent study out of the University of Eastern Finland found that one 30 minute sauna session can give the immune system a significant boost.
Researchers led by Professor Jari Laukkanen investigated the effects of sauna bathing on the human immune system.