Yes, and here's why:
In 2016, Dr Buijze studied over 3000 participants, over 90 days, to assess if cold showers reduced absence from work due to ill health. They found was a 29% reduction in sickness absence for people that finished their showers on at least 30 seconds of cold. The same paper also found that regular physical activity reduces sickness absence by 35%. When combined — both cold showers and exercise — there is a 54% reduction in self-reported sick days compared to those who don’t do either.
This paper had some surprising subjective results too. Here’s a quote from the author Dr Buijze talking about the perceived benefits of cold exposure:
“Even though the vast majority of participants reported a variable degree of discomfort during cold exposure, the fact that 91% of participants reported they will to continue such routine (and 64% actually did) is perhaps the most indicative of any health or work benefit. The most commonly reported beneficial effect was an increase in perceived energy levels (including many reported comparisons to the effect of caffeine).”
There’s a lot of talk out there in the science about lymphocytes, leukocytes, granulocytes, monocytes, natural killer cells, serum Igs, salivary IgA, cytokines, interleukin-6 concentrations and a whole host of other immune system cells… I won’t bore you with those, nor would it provide you with any more practical information. Moral of the story is - cold exposure works, so use it.
This study showed no difference between the 30, 60 and 90-second cold showering groups. Making the "hot to cold" transition arguably the most important time frame.
Simply turn the know to cold for 30 seconds before getting out of the shower each day. Bonus points for ice baths or beach swims. If you can't handle finishing the shower on cold. Do a contrast, hot-cold-hot (and repeat if you want).