if a person, me, is going grey you can rinse your hair with Yarrow tea and your natural hair color will return. Dr. Christopher said he obviously didn't use it because he was white headed, said he didn't care because he didn't have to look at himself LOL. He told about a woman who had been coming to most of his lectures for many years, at the beginning she had beautiful strawberry blond hair, her natural color. He said throughout the years he watched her turn grey. So one year she shows up and she has her beautiful strawberry blond hair back and he asks her what happened. She told him that she had been going trough her notes she had taken many years ago at one of his lectures and came across him telling about rinsing your hair with Yarrow tea to get your natural hair color back so she started rinsing her hair with Yarrow tea 3 to 4 times a day and she got her natural hair color back!