Hi Alex,
As Shane suggested medicinal grade parafin is a good choice. As Greg suggested it's best to oil the board when it is "warm", as this opens the grain of the timber and allows the oil to penetrate better. Put it in the sun for a couple of hours before oiling or warm it in the oven on about 50 degrees for 30 minutes.
What timber species are you planning to use? This is fairly important as some Australian hardwoods are not suitable to use for cutting boards as they will leach tanins and resins that will contaminate the food.
Cheers,
John B
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