If You Routinely Take Hot Showers, You Might Want To Stop. This Doctor Explains Why.
Briefly

Research suggests that cold showers offer numerous health benefits ranging from improved hair growth and skin rejuvenation to better circulation and mental health. While hot water can damage the skin's natural barriers, making it dry and irritated, a warm shower is recommended as a healthier alternative. Experts advise limiting shower time to five to ten minutes and adding a cold rinse at the end for maximum benefits, providing an invigorating finish that enhances well-being without harming the skin.
I actually went down a huge rabbit hole on PubMed, which is basically a scientific database that goes through all these articles, [and I found studies that show] a cold shower not only invigorates you more, it helps with hair follicles, it helps with hair growth, it helps with skin rejuvenation, with blood vessel dilation - it's awesome for you.
Cold water may also aid in workout recovery, boosting immune system responses, improving circulation and possibly even enhancing mental health.
Ideally [a shower should last] five minutes - five to 10 minutes. Anything longer ... disrupts the mantle of your skin, which can cause more harm than good.
If you can tolerate it, [during] the last 30 seconds, make it cold.
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