I am 61 years old and my hair was all grey, it started going grey at about 50.
For one year now I have been having the same smoothie apart from one ingrediant every day, replacing one meal.
I make my own kefir and to that I add, 1 Tbsp chia seeds, 1 Tbsp Vital Greens, 1 scoop of whey protein powder, I Tbsp organic coconut butter, 1 Tsp turmeric, 1 Tsp cinnamon
Two months ago I also added 1/2 tsp of organic Shatavari because I'd had some abnormal cells show up at a Pap smear. They are all normal now and my hair is going back to its natural colour, brown.
It is half brown and half grey in my regrow the now with more brown every week - yeh!
In my opinion the best remedy for Grey Hair, and this will restore it to its younger time in some people.
Plenty of whole grain Breads and Cereals which contain lots of wheat germ and bran for Brown Haired people, and some blondes who decend from Brown Haired Parents.
Some Blondes decend from Black Haired and Red Haired Parents and they need plenty of Thiamine and Folic acid in their foods.
People who have brown hair and decend from parents who have brown hair need lots of Niacin one of the B-Complex Vitamins.
I also make sure I'take a good multiple vitamin every day plus I get enough Vitamin C and Calcium and I also make sure I take a good B-Complex and at an advanced age I have found I can turn my hair back to Gray or color it naturally simply through diet, more rest and less stress.