I can never understand why no one reads the Nutrobal instructions rather than ask others what they do. It really is a very tiny amount that you are advised to put on. One pinch per Kg of animal .. which is practically nothing if you have a 100g tort .. so for a 100g tort you need only one tenth of a pinch and then you are advised to blow it over the food from the palm of your hand which means very little ends up on the food. But, that is the advice of the manufacturer so there must be a reason for that, perhaps it's as Ed says, more D3 in there than need be
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