How much ageing can be reversed is still in the realm of science fiction. But scientists seem confident of stopping the hair from turning grey.

It is the result of more than a decade's research at the laboratories of L'Oreal. The cosmetics major hopes to win the race to capture the world's £8 billion (approximately $12.9 billion) hair colour market.
Bruno Bernard, the company's head of hair biology said: "We have a watertight proof of concept with this, and we think it will have a market among men as well as women.”
The research team has published papers in specialist journals explaining how the absence of a protective enzyme called tyrosinase-related protein 2 (TRP-2) causes hair pigment cells to die with age.
Rather than develop a synthetic drug to mimic TRP-2, which would involve exhaustive clinical trials, the company screened thousands of naturally occurring compounds that humans are already exposed to, and found one in an unidentified fruit.
Another good news is it might not be expensive.
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Details will not be unveiled until the five-yearly International Investigative Dermatology meeting in May 2013.
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Source-Medindia