Good question. Was it ever tested so far ? I believe not.
My guess is that it is near as efficient as a cold shower. So you can go for Wim Hof method. It costs almost nothing comparatively.
As far as I am concerned, being hit with mild anxiety for more than 10 years, WBCT (3 minutes in a giant fridge cooled at -113° C) which I tried for 10 sessions didn't improve my symptoms. My physical recovery was a bit better.
My guess is that it is near as efficient as a cold shower. So you can go for Wim Hof method. It costs almost nothing comparatively.
As far as I am concerned, being hit with mild anxiety for more than 10 years, WBCT (3 minutes in a giant fridge cooled at -113° C) which I tried for 10 sessions didn't improve my symptoms. My physical recovery was a bit better.