Withania somnifera, known commonly as Ashwagandha, Indian ginseng, poison gooseberry, or winter cherry, is a plant in the Solanaceae or nightshade family. Used in shampoos, Ashwagandha is believed to help improve scalp circulation and strengthen the hair, as well as help get rid of dandruff. It also appears to stimulate production of melanin, the pigment responsible for the colour of your hair. So, it may actually reverse greying of hair.
May be helpful in treating a wide variety of illnesses including asthma, diabetes, hypertension, stress, arthritic diseases, and cancer.