It wasnarrated from Abu Dharr that the Messenger of Allah (ﷺ)said:
"Thebest things with which you change gray hair are henna andKatam."* (RU)
English reference (RU): Vol. 4, Book 32, Hadith 3622 (RU)
Arabic reference (RU): Book 32, Hadith 3753 (RU)