The 36-year-old actress, who has seven-year-old daughter Gracie from her relationship with David Thewlis, felt sick after finding grey hairs, so she researched natural methods for preserving her brunette locks and discovered the unusual brew, reported Contactmusic.
"I felt sick recently because I found one or two grey hairs and I read that curry leaves help to maintain your hair colour, so I mix them with hot water and drink it as a tea," she said.
Friel also drinks around 12 cups a day of the 'Master Cleanse', made of hot cayenne pepper, maple syrup and lemon juice, as a detox and anti-ageing treatment.
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