Suggest Remedy For Premature Grey Hairs

HI MY NAME IS JIGAR SHETH, IM JUST 24 YEARS OLD AND IM HAVING TOO MANY GREY HAIRS,RECENTLY I GOT SINGLE GREY HAIR ON MY BEARD, I REALLY FEEL UPSET LOOKING AND THINKING ABOUT IT.
PLEASE SUGGEST BEST OF TREATMENT AND ALSO SUGGEST GOOD DERMATOLOGIST IN MUMBAI WERE I CAN GET 100 % RESULT.

THANKING YOU,
JIGAR SHETH.