Is it true that you can slow down or even reverse the growth of grey hair?

I heard somewhere that grey hair has to do with certain hormone deficiency. Which hormone and how can i check my level/Is it true that you can slow down or even reverse the growth of grey hair?
It's the result of cell deformation, the only cure is to dye it.Is it true that you can slow down or even reverse the growth of grey hair?
Not true. If you wish to hide grey hair you'll have to dye it.