It makes them shiny too :-)
But don't over-do it, it doesn't take much.

And as far as humans go, neem oil will take care of head lice!!! Yes I know 'cuz we had them and instead of using the various toxic shampoos I just put a little neem oil in the regular shampoo and POOF ! lice gone. Neem oil is good for so many things I just LOVE it!