Suggest Treatment For Premature Greying Of Hairs

hello, I m 26 years male height 5 10 and weight 80kgs. i have got no medical history. I first saw white hair in my beard 2 yeras back. from last 8 months the quantity of white hair is more as i can see 30% of my hairs are white now. Is there any way i can stop the growth of white hair. I have to shave every day after to hide them. Is there any remedy for this or any medicine that can stop the growth? Please help me.