The Messenger of Allah said: "One of the best kinds of kohl that you use is Ithmid (antimony); it brightens the vision and makes the hair (eye-lashes) grow."
Sunan an-Nasa'i Book 48, Hadith 74
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Sunan an-Nasa'i Book 48, Hadith 73 Next Hadith → "I heard Jabir bin Samurah being asked about the gray hairs of the Prophet . He said: 'If he put oil on his head they could not be seen, but if he did not put oil on his head, they could be seen.'"

Sunan an-Nasa'i Book 48, Hadith 75