Absolutely necessary for beardies, not needed for BTS as long as they are fed D3-containing supplements or eat the livers of animals, such as rodents. Herbivores and omnivores just aren't set up to extract vitamin D very well from dietary sources, so beardies given D3 orally tend to accumulate it in their livers instead of using it effectively. BTS extract D3 from their diets quite well.
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