When your hair goes grey it is due to the fact that the cells in the hair follicles called "Melanocytes" no longer generate pigment, the main one being melanin. The hair follicle loses all pigment over time and eventually goes white. The white hairs against your darker hair give the effect of grey hair. As your hair is no longer as healthy as it use to be you need to consider treating it to prevent it from going brittle and lifeless.
The vital vitamins that your hair would need in this case is B12, and Omega 3's. You can take these supplements as tablets or you can use a shampoo that contains these types of nutrients. There are many products on the market that promise to treat Grey Hair or even take Gray Hair away. Beware as there are only a few that will actually be effective.
If you are looking for a shampoo that will replace the lost nutrients in your hair then you need to make sure that the ingredients of the shampoo will actually treat the problem. If the shampoo contains Emu oils then you know that the product will work. The Emu oil contained in the shampoo is known as the follicle awakener and has been used by many to help prevent the onset of gray hair. Every hair must have omega 3's to grow properly. And Emu oil is the only ingredient that we know that can moisturize the hair enough to get it back up to an 8% moisture rate as it is supposed to be.
Now although a shampoo with these types of ingredients will help with the lack of moisture in your hair you may find in some cases it will actually darken the hair and reverse the graying process to some degree. The Emu oil actually works at the root of the hair follicle by penetrating the hair strand rejuvenating the pigment.
Just because you have Grey Hair doesn't mean you shouldn't treat it with conditioner and shampoo. Grey Hair can look healthy if treated properly. If you use the correct products you will find your hair will be healthy, full of volume and in some cases you could even get your original hair color back.
Grant Marwick is a freelance writer and owner of http://www.no-gray-hair.com that provides solutions and advice on treating gray hair and grey hair treatments.