What is the best ratio of vitamin D3 to K2? Vitamin D3 is often measured in international units (IU) instead of micrograms (mcg). 1000 IU of vitamin D3 is equal to 25 mcg of vitamin D3. The best ratio of vitamin D3 to K2 is 1000:10—1000 IU (25 mcg) of vitamin D3 to 10 mcg […]
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