Hi Dr ghazanfar,
Thanks for writing in.
The canities or greying of hair is common problem.
It does not have a satisfactory treatment.
Few drugs know to be effective are Calcium pantothenate
and multimineral combination along with PABA and Calcium pantothenate should be taken once or twice a day.Continous intake for atleast 6 months is needed.
Already white hair cannot turn black ,but new hair whitening can be prevented.
Hope this helps.
I will be available for follow up.