is this 100% calcium?

100% natural phosphorus free oyster shell calcium carbonate

Can I give this to opossums? I have a litter of 5 I am trying to raise/release that came from a possum hit by car.

As far as I know this is only for reptiles, but I’m no expert on mammals. I’d recommend finding one made specifically for young mammals.

There is no expiration date on the package. Does this calcium ever go bad?

its straight calcium, no expiration date on this

Why do so many YouTube Leopard Gecko videos say to place Calcium WITHOUT Vitamin D3 into a dish for Leo inside the enclosure?

The D3 excess can make your gecko ill. Its better to feed them with no D3 calcium and use adequate UVB lights because Vit D3 is a natural occurrence in your gecko body, the vitamin D that your pet gets from the food converts to vit D3 because of the action of the sun (or lamp) UVB rays. Thats why if you feed him with excess D3 it can hurt your gecko kidneys.

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