How To Regrow Lost Hair?

hi i am 28 years old male, upto college days my hair will be thicker only but after that i have been facing the hair loss , itching on scalp and my 50 % of hair gone now, i could nt able to stop loss so i just shaved my head now, i want to know is there really any possibilities to regrow the hair in human head by natural through medicine , i did nt take any treatment anywhere just trying to follow home remedies , if regrow is possibility ? how ? what treatment ?