Cold water immersion has useful research behind some recovery outcomes, but many broad wellness claims are stronger than the evidence currently supports.
Several systematic reviews report improvements in delayed muscle soreness after strenuous exercise.
Research reports benefits for selected recovery outcomes, but results depend on exercise type, timing and the measure being tested.
A 2025 review found possible effects across stress, sleep and quality of life, while also emphasizing small studies and limited population diversity.
Research uses many temperatures and durations. Current evidence does not establish one universal protocol for every goal.
The evidence does not support treating the coldest possible water as automatically superior.