Vitamins & supplements.

There are three types I use which are:

Cuttlefish.
Limestone flour/powder.
Nutrobal.

Limestone flour: (calcium carbonate) Sprinkle on food every day.

Nutrobal: (vitamins and minerals) Sprinkle on food 2 or 3 times a week.

Cuttlefish: Place a piece in your tortoises enclosure allowing them to nibble on it when they choose,
 it also helps to file down the beak naturally.