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Hydrotherapy with cold water can increase beta-endorphin and noradrenaline levels in the blood, as well as noradrenaline levels in the brain, which may in turn have an anti-depressant effect on mood,” says Sheenie Ambardar, M.D., a Beverly Hills-based psychiatrist. A study published in the journal Medical Hypotheses found that taking two to three minute cold showers on the reg (like, 68-degrees cold) over a two-week period boosted the moods of their participants.