Calcium powder is almost always calcium carbonate. Feeding calcium carbonate is generally a bad idea because it throws off the calcium to phosphorus ratio. Bone has the right ratio, even pinkie mouse bone. Extra calcium passes out in the poop, at best, which is a waste of money. At worst, extra calcium is deposited in soft tissues, where it is injurious to the snake.
A liquid vitamin preparation can be injected into a dead mouse's body cavity, and the mouse is then fed to the snake. Pet stores often carry liquid vitamins that are added to cage bird water containers.
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