Hi,
dear homoeopathic medicines are really an effective treatment for premature greying of hair, but the grey hair can't be turned black back again! rather it prevents further greying of your rest of the remaining black hair. Also, need to rule out any underlying medical causes (get blood tested for hemoglobin, total iron binding capacity, serum ferritin (s. Ferritin), serum calcium (s. Ca), serum iron (s. Iron), vitamin b12, and vitamin d3 and tft done).
And remember, it's not a magic wand which will show you results quickly.