It is the work of the stem cells which helps to maintain our bodies healthy and heal wounds. Stem cells renew and aid the regeneration of all other cells in the body – including those of the skin, nails and hair. These regenerated cells are called adult stem cells. They reside in some adult tissues only.
Recently in the medical field, research has been active on "regenerative medicine," which utilizes the stem cells to repair illness- and injury-damaged organs and tissues.
In 2009, a research team at the University of Toronto discovered a therapeutic application for restoring hair growth in those suffering from hair loss (alopecia)—and in those combatting the underlying causes that lead to the telltale signs of a damaged scalp. Their research was in the area of adult stem cells.