Is Vitamin D3 a fat-soluble vitamin? What exactly does that mean?

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Yes, Vitamin D3 is a fat-soluble vitamin. This means that it can be stored in our fatty tissue and is used by our body when needed. Excess amounts of vitamin D3 can accumulate in the body and cannot be excreted like water-soluble vitamins. Our dosage is therefore well below the tolerable upper limit for vitamin D.