cold water therapy

hi guys my first time here!  has anyone heard about the health benefits of cold water therapy? Some people advocate , Cold showers provide a gentle form of stress that leads to thermogenesis (internal generation of body heat), turning on the body’s adaptive repair systems to strengthen immunity, enhance pain and stress tolerance, and ward off depression, overcome chronic fatigue syndrome, stop hair loss, and stimulate anti-tumor responses. http://gettingstronger.org/ is where a found it,although some studies have shown that it can cause transient arrhythmias in patients with heart problems and can also inhibit humoral immunity. the inhibit humoral immunity, is the part that freaks me out!!!!!! my count is only 345.  i would so love to do this ,if it would help!!!! love cold water!