Isn't it obvious that cold showers will make you more resilient to cold? Even if we assume there aren't any health benefits - which would be foolish IMO, being resilient to cold is a benefit in itself.
If you're waiting for science to put a number on everything before you consider it you'll be disappointed in the long run.
If you're waiting for science to put a number on everything before you consider it you'll be disappointed in the long run.