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Is it true that … hard water damages hair?

The Guardian UK Monday 07 September 2026, 07:00 UTC By Kate Lloyd 1 min read
Key Points

Mineral deposits can accumulate, making hair drier, but removing them can cause different problemsFrom hair treatments to shower filters, a wave of products have been launched promising to protect hair from the “problems” caused by living in a hard-water area. But are they really necessary? “Hard water has a higher concentration of dissolved minerals, especially calcium and magnesium,” says Desmond Tobin, professor of dermatological science at University College Dublin.

Mineral deposits can accumulate, making hair drier, but removing them can cause different problems

From hair treatments to shower filters, a wave of products have been launched promising to protect hair from the “problems” caused by living in a hard-water area. But are they really necessary? “Hard water has a higher concentration of dissolved minerals, especially calcium and magnesium,” says Desmond Tobin, professor of dermatological science at University College Dublin. “These are naturally occurring in water, particularly water that is not rainwater.”

When water moves through soil and rocks, such as limestone, minerals dissolve into it and remain there when it comes out of your tap. These minerals are responsible for the limescale that builds up in your kettle.

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Desmond Tobin (PERSON) University College Dublin (ORG)
Originally published by The Guardian UK Read original →

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