This could be something someday...
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Hate that gray? Take a pill to make it go away! An unexpected side effect has researchers studying a drug normally used to treat leukemia. French doctors found five men and four female grey-haired patients being teated with Gleevic, ended up having their hair colour actually change back to its original shade of black.
Researchers are trying to discover if others have experienced similar side effects, puzzling over why it happened, whether it's common and calling it a 'mystery'. Complicating their probe: many of the women in the study already coloured their hair, making it difficult to track the changes. Like most therapy involving drugs, the change is gradual. The hair colour restoration reported in eight of the nine known cases took about 5 months, while one saw changes only after about 2 years.
Experts caution the apparent shade restoring effects of the drug don't mean you should take it if you don't need it. They want to do further study to see whether their discovery is an anomaly, and if not, why it has that hair hue alternation effect. Meaning they'll be using their grey matter to study these grey matters.