How cold should the water be. Is the coldest setting on your shower at home enough?

When it comes to using cold water for the benefits like increased dopamine and alertness, the optimal temperature is between 45 to 55 degrees Fahrenheit. For a cold shower at home to be effective, it needs to be sufficiently cold to make you uncomfortable, but still safe to avoid any health risks, such as cardiovascular issues 1.

Andrew Huberman mentions that a cold shower can be sufficient if it gets cold enough to trigger a strong urge to exit the water. The aim is to achieve a subjective discomfort level, without endangering yourself 1. If your shower doesn't get as cold as necessary, it might still provide some benefits, but the effects might be less pronounced compared to colder water or full cold immersion, like in a dedicated cold plunge.

For those starting, it's suggested to start at temperatures around 55-60 degrees Fahrenheit and then gradually work down to colder temperatures as you become more accustomed and assess your body's response 2. Always prioritize safety and ensure you can adjust quickly to avoid any adverse effects.