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Biotin is a B vitamin that’s naturally found in eggs, bananas and cauliflower.

As Holland and Barrett explains, many people with a biotin deficiency develop hair loss or dry skin, so it’s thought that increasing your biotin intake may help improve your hair, skin and nail health.

“While there are only a small amount of studies in this area, there has been some reported success,” reports the health body.

It points to a study published in Journal of Drugs in Dermatology, which reported that taking 2.5mg of biotin a day could improve brittle nails.

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