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 ...
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