To answer your question, D3 is produced by the body when the animal is exposed to nature sun light, this vitamin is used in the body to help metabolize the calcium in the diet.
So if your animal is exposed to natural sunlight then you don’t use D3 doing so can damage the kidneys. However if you are indoors then use D3 otherwise the animal can not absorb the calcium in his diet.

Sam Pascucci

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