Sorry if this question doesn't fit to this particular sub-forum, I don't know anything about biology and I didn't know to which subject this question is belong.
From what I understood the melanocyte stem cells produce melanocytes which in turn produce melanin in the hair and the lack of melanocytes stem cells and melanocytes are at least the main cause of hair graying and are the cause of the failure of hair graying treatments like this one(link "There is a portion of of white old hairs that may not covert to pigmented hair due to complete loss of McSCs") and even in a new available hair product that reverse hair graying only if there is some melanocytes left in the hair follicle.
But how the melanocytes/melanocyte stem cells can be restored in the hair follicle?, There is an available or a research about theoretical way of reproducing new melanocytes/melanocyte stem cells inside the body/hair follicle itself?, Or mybe transplanting melanocytes/melanocyte stem cells from other parts of the body into the hair follicles?. or mybe even using Induced Pluripotent Stem Cells to create new melanocytes/melanocyte stem cells like what was done in this research(link)?
Edited by petrichor, 20 August 2018 - 09:02 AM.