Natural remedies to stop premature grey?

I saw my first grey strand at 18. At 26 they became more prevalent. Now, I am 33 years old and graying around the sides and top of my head. This is not genetic grey. My mother, grandmothers, and sister look quite young. I’ve had alot of problems in my life and I know this is from stress.

If you know of any natural/herbal supplements or natural topical solutions to slow this down, I would appreciate the information.
I have heard of Amla, but I I don’t know if I should take it orally or use it topically. That is all I know of.