I think I read something like this on Mercola Harold, its very interesting 
isn't it?  dee

On 2 Feb 2010, at 03:35, Harold MacDonald wrote:

>     From an excerpt of research done on why hair goes grey,the reason given 
> by the researchers was that at the base of the hair follicle there are two 
> glands,one is for H2O2 and the other is pigment.The report didn't exactly say 
> what the reason for the H2O2 was.I assumed it was for protection from 
> pathogens trying to enter thru the follicle.The pigment gland is 
> obvious.There was no mention re oil glands .
>     Now the grey hair part,due to age,health insults to the body,etc. this 
> pigment gland is not being controlled by another gland and production of 
> colour ebbs, so the H2O2 is now bleaching  the hair shaft.
> I am trying to do this from memory as my hard drive was corrupted some time 
> ago.
>  
>     I used to wonder why too.
>  
> Harold