I used to put mineral oil on my cutting board, a messy process, and doesn't IMHO give great results.
As I wandered around the hardware store, I found something called board butter, a mix of mineral oil, beeswax, and carnauba wax.
Wow this stuff gives my cutting board an amazing finish.
I think if you have a relatively shitty board like I do, the mineral oil gets sucked deep into the wood and doesn't really seal the surface. This butter stuff stays where it's supposed to.
There's a mild pleasant smell to it, but that smell disappears from the board after 5 minutes.
Definitely recommend, as it's also easier to apply.