best calcium suppliment?

[Widgitwoo]

Hi,
What calcium suppliments do you use for your tortoises?

I have 1 Hermann and 1 spur thighed both 5 years old, and I want to make sure I am giving them the right suppliments
When I got them I got given the Zoo Med Repti Calcium without D3. Is this ok?

They are fed on plants I grow in the garden, they also have cuttlefish bones in there indoor enclosure to nibble on.

they get the calcium on their food twice a week and they get weekly baths.

Thanks in advance for any tips or suggestions