I have found that as I have aged (now 36) that my beard is thicker and more complete. Whether that has anything to do with PH use, I don't know for sure but I think it helped a little. Also, when I supplement with either DHEA or Relora, my body hair grows in thicker and darker.
But genetically, I come from gorilla stock.
*shakes tree branches, pounds on chest and struts off*