Jojoba oil is the closest natural oil to our own sebum.
It has been used for centuries as a conditioner for hair and skin.
The secret to using this oil, which is in fact a wax substance, is to use a very,very small amount as too much will compromise the bond,as will too much of any conditioning product.
I personally use jojoba oil and find it does a great job in keeping the hair from drying out.
A quick google search will tell you all you need to know.